[aperture]

I find this functionality is very cool, but does it have to be motion sensing? I find physically moving your hand off the keyboard and back on to be somewhat tiring, especially since it's doing apparently the same thing as "scroll down". But since the hand stays on the left side, how about adding a button underneath the left palm, where by moving the palm slightly the command is performed? This I think takes away any inconsistencies of "motion sensing" while still keeping your efficiency at a high (not to mention keeping your hands comfortable!).

[cheeseprocedure]

I wonder if there's RSI implications when hands-off-keyboard gestures are used more than sparingly.