Eye gaze and Face can only use the webcam as inputs. It would be good to allow another mode where X/Y properties control which direction the face is facing (controls parallax) and which way the eyes are looking.
In my case I want to hook up to an external MIDI source so can use HTC Vive VR equipment to control eye gaze and parallax. I could possibly use Transform behaviors with a lot of care, but its tricky as you need to get the transform for both eyes correct (calibration is hard). It also means the puppet can be used one way or the other - not both.