Along a similar vein, I'm interested in adding a scroll-wheel to an existing keyboard, specifically this 11800 with a trackball and mouse buttons... How rad would it be to totally remove my mouse? I've basically done that now, but I'm (hating) using the arrowkeys to navigate webpages. Sure, it's better than grabbing the slider on the side of the window, but not by much. I have the perfect spot to throw a standalone scrollwheel in this thing, I just have to figure out HOW. Also need to figure out how to wire it up...
Barring that... I'd like to remap the caps-lock key to act as a modifier to make mouse movements (this is a trackball) work as wheel rolls. For example, it would be cool to hold down the Caps key and roll the trackball down to emulate mouse-wheeling down. Anybody have any experience with that as a mod??