I came across this device earlier and haven't made my mind up yet on its practicality. I was thinking about binding targeting or movement of individual clones, but I could just see myself smashing down my hand onto the keys.

3M brand USB optical mouse with an integrated numpad, model LX451



http://www.amazon.com/LX451-Optical-.../dp/B0002XK1HW

Measures 4.5 x 3 x 1.2 inches. $45.00 - $55.00