diff --git a/comfy/cli_args.py b/comfy/cli_args.py
index a2679a517..9e15ced6f 100644
--- a/comfy/cli_args.py
+++ b/comfy/cli_args.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import logging
 import sys
+from comfy.cli_args_types import FlattenAndAppendAction
 from importlib.metadata import entry_points
 from types import ModuleType
 from typing import Optional
@@ -36,8 +37,8 @@ def _create_parser() -> EnhancedConfigArgParser:
                         help="Enable CORS (Cross-Origin Resource Sharing) with optional origin or allow all with default '*'.")
     parser.add_argument("--max-upload-size", type=float, default=100, help="Set the maximum upload size in MB.")
     parser.add_argument("--base-directory", type=str, default=None, help="Set the ComfyUI base directory for models, custom_nodes, input, output, temp, and user directories.")
-    parser.add_argument("--extra-model-paths-config", type=str, default=None, metavar="PATH", nargs='+',
-                        action='append', help="Load one or more extra_model_paths.yaml files.")
+    parser.add_argument("--extra-model-paths-config", type=str, default=[], metavar="PATH", nargs='+',
+                        action=FlattenAndAppendAction, help="Load one or more extra_model_paths.yaml files. Can be specified multiple times or as a comma-separated list.")
     parser.add_argument("--output-directory", type=str, default=None, help="Set the ComfyUI output directory. Overrides --base-directory.")
     parser.add_argument("--temp-directory", type=str, default=None,
                         help="Set the ComfyUI temp directory (default is in the ComfyUI directory). Overrides --base-directory.")
diff --git a/comfy/cli_args_types.py b/comfy/cli_args_types.py
index 8f32defa6..b46baef68 100644
--- a/comfy/cli_args_types.py
+++ b/comfy/cli_args_types.py
@@ -73,7 +73,6 @@ class Configuration(dict):
         temp_directory (Optional[str]): Temporary directory for processing.
         input_directory (Optional[str]): Directory for input files. When this is a relative path, it will be looked up relative to the cwd (current working directory) and all of the base_paths.
         auto_launch (bool): Auto-launch UI in the default browser. Defaults to False.
-        disable_auto_launch (bool): Disable auto-launching the browser.
         cuda_device (Optional[int]): CUDA device ID. None means default device.
         cuda_malloc (bool): Enable cudaMallocAsync. Defaults to True in applicable setups.
         disable_cuda_malloc (bool): Disable cudaMallocAsync.
@@ -188,7 +187,6 @@ class Configuration(dict):
         self.temp_directory: Optional[str] = None
         self.input_directory: Optional[str] = None
         self.auto_launch: bool = False
-        self.disable_auto_launch: bool = False
         self.cuda_device: Optional[int] = None
         self.cuda_malloc: bool = True
         self.disable_cuda_malloc: bool = True
@@ -352,7 +350,7 @@ class Configuration(dict):
 
 class EnumAction(argparse.Action):
     """
-    Argparse action for handling Enums
+    Argparse action for handling Enums in a case-insensitive manner.
     """
 
     def __init__(self, **kwargs):
@@ -362,23 +360,33 @@ class EnumAction(argparse.Action):
         # Ensure an Enum subclass is provided
         if enum_type is None:
             raise ValueError("type must be assigned an Enum when using EnumAction")
-        enum_type: Any
         if not issubclass(enum_type, enum.Enum):
             raise TypeError("type must be an Enum when using EnumAction")
 
-        # Generate choices from the Enum
-        choices = tuple(e.value for e in enum_type)
-        kwargs.setdefault("choices", choices)
-        kwargs.setdefault("metavar", f"[{','.join(list(choices))}]")
-
-        super(EnumAction, self).__init__(**kwargs)
-
         self._enum = enum_type
 
+        # Generate choices from the Enum for the help message
+        choices = tuple(e.value for e in enum_type)
+        kwargs.setdefault("metavar", f"[{','.join(list(choices))}]")
+
+        # We handle choices ourselves for case-insensitivity, so remove it before calling super.
+        if "choices" in kwargs:
+            del kwargs["choices"]
+
+        super(EnumAction, self).__init__(**kwargs)
+        self._choices = choices
+
     def __call__(self, parser, namespace, values, option_string=None):
-        # Convert value back into an Enum
-        value = self._enum(values)
-        setattr(namespace, self.dest, value)
+        # Convert value back into an Enum, case-insensitively
+        value_lower = values.lower()
+        for member in self._enum:
+            if member.value.lower() == value_lower:
+                setattr(namespace, self.dest, member)
+                return
+
+        # If no match found, raise an error
+        msg = f"invalid choice: {values!r} (choose from {', '.join(self._choices)})"
+        raise argparse.ArgumentError(self, msg)
 
 
 class ParsedArgs(NamedTuple):
@@ -401,3 +409,25 @@ class EnhancedConfigArgParser(configargparse.ArgParser):
 
         namespace, unknown_args = super().parse_known_args(args, namespace, **kwargs)
         return ParsedArgs(namespace, unknown_args, config_files)
+
+
+class FlattenAndAppendAction(argparse.Action):
+    """
+    Custom action to handle comma-separated values and multiple invocations
+    of the same argument, flattening them into a single list.
+    """
+    def __call__(self, parser, namespace, values, option_string=None):
+        items = getattr(namespace, self.dest, None)
+        if items is None:
+            items = []
+        else:
+            # Make a copy if it's not the first time, to avoid modifying the default.
+            items = items[:]
+
+        # 'values' will be a list of strings because of nargs='+'
+        for value in values:
+            # Split comma-separated strings and add them to the list
+            items.extend(item.strip() for item in value.split(','))
+
+        # Set the flattened list back to the namespace.
+        setattr(namespace, self.dest, items)
diff --git a/tests/unit/test_cli_args.py b/tests/unit/test_cli_args.py
new file mode 100644
index 000000000..398de8a54
--- /dev/null
+++ b/tests/unit/test_cli_args.py
@@ -0,0 +1,126 @@
+import pytest
+from unittest.mock import patch
+from comfy import cli_args
+from comfy.cli_args_types import LatentPreviewMethod
+
+# Helper function to parse args and return the Configuration object
+def _parse_test_args(args_list):
+    parser = cli_args._create_parser()
+    # The `args_parsing=True` makes it use the provided list.
+    with patch.object(parser, 'parse_known_args_with_config_files', return_value=(parser.parse_known_args(args_list)[0], [], [])):
+        return cli_args._parse_args(parser, args_parsing=True)
+
+@pytest.mark.parametrize("args, expected", [
+    ([], []),
+    (['--extra-model-paths-config', 'a'], ['a']),
+    (['--extra-model-paths-config', 'a', '--extra-model-paths-config', 'b'], ['a', 'b']),
+    (['--extra-model-paths-config', 'a,b'], ['a', 'b']),
+    (['--extra-model-paths-config', 'a,b', '--extra-model-paths-config', 'c'], ['a', 'b', 'c']),
+    (['--extra-model-paths-config', ' a , b ', '--extra-model-paths-config', 'c'], ['a', 'b', 'c']),
+    (['--extra-model-paths-config', 'a,b', 'c'], ['a', 'b', 'c']),
+])
+def test_extra_model_paths_config(args, expected):
+    """Test that extra_model_paths_config is parsed correctly."""
+    config = _parse_test_args(args)
+    assert config.extra_model_paths_config == expected
+
+def test_default_values():
+    """Test that default values are set correctly when no args are provided."""
+    config = _parse_test_args([])
+    assert config.listen == "127.0.0.1"
+    assert config.port == 8188
+    assert config.auto_launch is False
+    assert config.extra_model_paths_config == []
+    assert config.preview_method == LatentPreviewMethod.Auto
+    assert config.logging_level == 'INFO'
+    assert config.multi_user is False
+    assert config.disable_xformers is False
+    assert config.gpu_only is False
+    assert config.highvram is False
+    assert config.lowvram is False
+    assert config.normalvram is False
+    assert config.novram is False
+    assert config.cpu is False
+
+def test_listen_and_port():
+    """Test --listen and --port arguments."""
+    config = _parse_test_args(['--listen', '0.0.0.0', '--port', '8000'])
+    assert config.listen == '0.0.0.0'
+    assert config.port == 8000
+
+def test_listen_no_arg():
+    """Test --listen without an argument."""
+    config = _parse_test_args(['--listen'])
+    assert config.listen == '0.0.0.0,::'
+
+def test_auto_launch_flags():
+    """Test --auto-launch and --disable-auto-launch flags."""
+    config_auto = _parse_test_args(['--auto-launch'])
+    assert config_auto.auto_launch is True
+
+    config_disable = _parse_test_args(['--disable-auto-launch'])
+    assert config_disable.auto_launch is False
+
+    # Test that --disable-auto-launch overrides --auto-launch if both are present
+    # The order matters, argparse behavior. Last one wins for store_true/false.
+    config_both_1 = _parse_test_args(['--auto-launch', '--disable-auto-launch'])
+    assert config_both_1.auto_launch is False
+
+    config_both_2 = _parse_test_args(['--disable-auto-launch', '--auto-launch'])
+    assert config_both_2.auto_launch is False
+
+def test_windows_standalone_build_enables_auto_launch():
+    """Test that --windows-standalone-build enables auto-launch."""
+    config = _parse_test_args(['--windows-standalone-build'])
+    assert config.windows_standalone_build is True
+    assert config.auto_launch is True
+
+def test_windows_standalone_build_with_disable_auto_launch():
+    """Test that --disable-auto-launch overrides --windows-standalone-build's auto-launch."""
+    config = _parse_test_args(['--windows-standalone-build', '--disable-auto-launch'])
+    assert config.windows_standalone_build is True
+    assert config.auto_launch is False
+
+def test_force_fp16_enables_fp16_unet():
+    """Test that --force-fp16 enables --fp16-unet."""
+    config = _parse_test_args(['--force-fp16'])
+    assert config.force_fp16 is True
+    assert config.fp16_unet is True
+
+@pytest.mark.parametrize("vram_arg, expected_true_field", [
+    ('--gpu-only', 'gpu_only'),
+    ('--highvram', 'highvram'),
+    ('--normalvram', 'normalvram'),
+    ('--lowvram', 'lowvram'),
+    ('--novram', 'novram'),
+    ('--cpu', 'cpu'),
+])
+def test_vram_modes(vram_arg, expected_true_field):
+    """Test mutually exclusive VRAM mode arguments."""
+    config = _parse_test_args([vram_arg])
+    all_vram_fields = ['gpu_only', 'highvram', 'normalvram', 'lowvram', 'novram', 'cpu']
+    for field in all_vram_fields:
+        if field == expected_true_field:
+            assert getattr(config, field) is True
+        else:
+            assert getattr(config, field) is False
+
+def test_preview_method():
+    """Test the --preview-method argument."""
+    config = _parse_test_args(['--preview-method', 'TAESD'])
+    assert config.preview_method == LatentPreviewMethod.TAESD
+
+def test_logging_level():
+    """Test the --logging-level argument."""
+    config = _parse_test_args(['--logging-level', 'debug'])
+    assert config.logging_level == 'DEBUG'
+
+def test_multi_user():
+    """Test the --multi-user flag."""
+    config = _parse_test_args(['--multi-user'])
+    assert config.multi_user is True
+
+def test_disable_xformers():
+    """Test the --disable-xformers flag."""
+    config = _parse_test_args(['--disable-xformers'])
+    assert config.disable_xformers is True