On , the latest master (and promoted, and 4.9) still have FSteamController inheriting from IInputDevice and not from IMotionController.
I’m sure I saw a commit on there that changed this, but I cannot find it now, and if it’s not in promoted or 4.9 then it probably won’t make it into the 4.9 preview or release? Or do the binary releases differ from what’s on ? Edit: And I just checked the 4.9.0-preview-1 tag, it also does not inherit from IMotionController.
Edit again:
Nevermind. I was confusing SteamController and SteamVRController. The latter does indeed inherit from IMotionController.