Not a scroll wheel for me; either a 1-d capacitive touch sensor (think touchpad, but 1d; or think iPod touch wheel, but unwound) or a group of buttons; say, wouldn't 4 buttons in a diamond over there be pretty dandy, either as alternate cursor keys (in a web browser, the d-pad could select links, and the 4-keys could scroll), or as auxiliary function buttons to perform... auxiliary functions, like jump, fire, etc.; wouldn't that be innovative?