Just as a piece of advice, Jim will almost definitely have to check with engineering. He had to do that with my keyboard, because I wanted a different key layout. Don't flip out until after he checks with them. Or if he says he won't/can't check.
I'm surprised there aren't more people with USB customizers on this board. I wanted one, but could only get a PS/2 model, due to custom programming. Not sure why the difference, though.