Well, interestingly. I found in PaperUI if I create a “Room” Thing and set the unit number that of a Compose “Scene Control Switch” , I will get on, off, scene A, B, C, D, state, etc. channels for the device. By playing around in the Control I can get the room to turn on/off, but there is no dimmer and scenes do not work.
I can also create a UPB Unit Thing and set it’s unit number to that of a Compose “Room” and it will provide On, Off, Dim channels. The dim slider doesn’t work very well, but it does kinda work, and on/off work correctly. But no scenes are present or work - this probably makes sense since extended X-10 Codes are sent to trigger Compose scenes, however, I’d have thought that the OmniPro II would have abstracted that.