Create_OneArg now working

Docs/Unsupported-SingleClass-Factories.md

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+# Unsupported Factories with 1 Class-Type Parameter
+
+## Standard candidates (class picker, flag-based filtering)
+
+All of these follow the same basic pattern: TSubclassOf<Base>, open a
+class picker dialog, filter on class flags.
+
+- AudioSynesthesiaNRTFactory — AudioSynesthesiaNRTClass
+  TSubclassOf<UAudioSynesthesiaNRT>
+  Flags: no abstract, no deprecated, no newer-version-exists
+
+- AudioSynesthesiaNRTSettingsFactory — AudioSynesthesiaNRTSettingsClass
+  TSubclassOf<UAudioSynesthesiaNRTSettings>
+  Flags: no abstract, no deprecated, no newer-version-exists
+
+- AudioSynesthesiaSettingsFactory — AudioSynesthesiaSettingsClass
+  TSubclassOf<UAudioSynesthesiaSettings>
+  Flags: no abstract, no deprecated, no newer-version-exists
+
+- CurveFactory — CurveClass
+  TSubclassOf<UCurveBase>
+  Flags: no abstract, no deprecated, no newer-version-exists
+  Also checks CanCreateAssetOfClass()
+
+- DataAssetFactory — DataAssetClass
+  TSubclassOf<UDataAsset>
+  Flags: no abstract, no deprecated, no newer-version-exists, no hide-dropdown
+  Also checks CanCreateAssetOfClass()
+
+- InputAction_Factory — InputActionClass
+  TSubclassOf<UInputAction>
+  Flags: no abstract, no deprecated, no newer-version-exists, no hide-dropdown
+  Skips dialog if no subtypes exist
+
+- InputMappingContext_Factory — InputMappingContextClass
+  TSubclassOf<UInputMappingContext>
+  Flags: no abstract, no deprecated, no newer-version-exists, no hide-dropdown
+  Skips dialog if no subtypes exist
+
+- PhysicalMaterialFactoryNew — PhysicalMaterialClass
+  TSubclassOf<UPhysicalMaterial>
+  Flags: no abstract, no deprecated, no newer-version-exists
+  Also checks CanCreateAssetOfClass()
+
+- PhysicalMaterialMaskFactory — PhysicalMaterialMaskClass
+  TSubclassOf<UPhysicalMaterialMask>
+  Flags: no abstract, no deprecated, no newer-version-exists
+  Also checks CanCreateAssetOfClass()
+
+- SoundSourceEffectFactory — SoundEffectSourcepresetClass
+  TSubclassOf<USoundEffectSourcePreset>
+  Flags: no abstract, no deprecated, no newer-version-exists
+
+- SoundSubmixEffectFactory — SoundEffectSubmixPresetClass
+  TSubclassOf<USoundEffectSubmixPreset>
+  Flags: no abstract, no deprecated, no newer-version-exists
+
+## Slightly unusual candidates
+
+- CameraAssetFactory — CameraDirectorClass
+  TSubclassOf<UCameraDirector>
+  Flags: no abstract, no deprecated (does NOT check newer-version-exists)
+  Allows "None" option (parameter can be null)
+
+- SlateWidgetStyleAssetFactory — StyleType
+  TSubclassOf<USlateWidgetStyleContainerBase>
+  Flags: no abstract, no deprecated, no newer-version-exists
+  Explicitly excludes the base class itself
+
+- TemplateSequenceFactoryNew — BoundActorClass
+  TSubclassOf<UObject> but dialog restricts to actors only (bIsActorsOnly)
+  Effective base class is AActor
+  No explicit flag filtering beyond class viewer defaults
+
+## Complex / special cases (probably not suitable for Create_ClassArg)
+
+- ControlRigBlueprintFactory — ParentClass
+  TSubclassOf<UControlRig>
+  Complex custom filter: native-only, must have IsBlueprintBase="true"
+  metadata, no blueprint parents. Also calls CanCreateBlueprintOfClass
+  in FactoryCreateNew. Dialog gated behind a CVar.
+
+- LiveLinkBlueprintVirtualSubjectFactory — ParentClass
+  ParentClass is hardcoded. The actual configured parameter is "Role"
+  (TSubclassOf<ULiveLinkRole>) with a custom modal dialog and a filter
+  that checks IsAllowableBlueprintVariableType on the role's structs.
+  Different parameter than what SysInfo_Factories reported.
+
+## Not class parameters at all (remove from consideration)
+
+- MetaSoundFactory — ReferencedMetaSoundObject
+  TObjectPtr<UObject>, not TSubclassOf. Optional reference to an
+  existing MetaSound object for preset initialization.
+
+- MetaSoundSourceFactory — ReferencedMetaSoundObject
+  Same as above.
+
+- ObjectMixerBlueprintFilterFactory — ParentClass
+  Hardcoded to UObjectMixerBlueprintObjectFilter in constructor.
+  No config dialog. Nothing to configure.