en-visioned mouse:

test! if when it's off when desktop is off UNLESS i'm in the mood to use it as night lights :P

retractable wire OR wireless

at least a usb capable OR PS/2 with usb converter

clicking:

must be fast click/low impulse (sounds like a very small mouse but is not small)

must be soft click/low strain on the pointing finger

context menu button/2X click/3X click [optional]

scroll:

the more concave the better-3rd mouse button "scroll"

+scroll:

horizontal scroll

side buttons

& should be ERGONOMIC!!!

fan: optional