I may be misreading your question/problem, sorry if this is not what you are after.
You can select/change each side of the doors material and trim regardless of the Interior Door type (doorway, hinged, pocket etc).
To do this go to "Interior Door Specification - General". You need to tick the check box next to "Separate Trim and Materials on Each Side". You should now be able to independently change the Interior/Exterior Casing details.