This wouldn't be a great experience because in addition to accelerometers, and gyros you can't really emulate MultiTouch with a pointer: one finger down would n

This wouldn't be a great experience because in addition to accelerometers, and gyros you can't really emulate MultiTouch with a pointer: one finger down would need to involve a click (to distinguish between movement and swiping), and the other gestures would need some indication of where (and how big) the "hand" is relative to the screen.