I didn't claim it was the end-all did I? Reaction accuracy > reaction speed, and positioning and wits can help beat better aiming players.
I just want to map some buttons to it and hope they work FAST

In CoD4 I've got knife mapped to the keyboard atm, I often press it in a twitch when running into someone. If I could map it to my mind it'd save me buttons + it might be faster. That's what I'm hoping to see in this thread, whether or not it made you guys faster or even if it's just a decent replacement for the keyboard, keeping my fingers on the strafe keys.
What you say about sports isn't true btw, I've competed on a european level in martial arts for a decade and the reactions & coordination just carry over to mousing (ultra low sense mousing is similair to the lower arm motions in sporting). I've read plenty of examples online of athlethes picking up FPS games easily for similair reasons. Funny thing is that some of my other team members have something similair, their hand-eye coordination somehow carries over from guitar play, making their wrist-aim style really smooth =D
Edit: just read in Chris Buer's report that he is faster still with the mouse than with NIA. Any numbers available?
The eating while playing thing sounds difficult, I grab a small bite or a drink occasionaly while playing...