Well with the G11 or G15 your extra keys are thrown off to the left making the trip back and forth between them and WASD next to impossible, I figure xkeys has so many buttons mapping 4 movement keys on there would be fairly ideal, but I don't really have the desktop space for xkeys. Since yesterday I've picked up a Logitech G9 and have been playing with the extra keys, for the two on the side I have one for tab and another for walk backwards, and I've assigned the tilt keys to straffe, but the feedback on the tilt wheel is miminal, but I guess it'll take some betting used to. combine that with the left + right mouse click for forward and I can move, butit's not natural. I imagine I'm moving around like the very first time I played doom or quake