Hi Ryan,
There is no widget for it at the time and not really a great option, however, if you combine it with Mx model reflection you might be able to create something with the current widget and not having to create your own widget.
The Mx model reflection logic captures the enum values + keys in the MxObjectEnum/MxObjectEnumValue/MxObjectEnumCaptions entities.
Combine that with a java action that converts the selected enum value back into an actual enum (which is essentially just passing in the MxObjectEnumValue.Name attribute and then returning it) should give you the ability to implement a more user-friendly enum value selector.
Good luck,
Mitchel