Well, The Tone, the only thing I play really is Quake 3. As I told you, I got Ghost Recon, but since I got back online I have been busy with competition (and various house things). So, the only weapon I really need that type of precision with is the railgun. I have set up scripts (Q3 really is a wonderful game in this regard) so that when I switch to the railgun, my sensitivity drops to 1/4 what it normally is. So for running and other weapons that don't require the precision of a railgun, it's quick, but with the rail, I move slower. And that's really where the precision is. I'm not sure if you can do that in Ghost Recon. But it's definitely helped my rail quite a bit. You simply have more time that you're moving over a target, and that gives you a bigger window to fire in. If you have cat-like reflexes, a higher sensitivity might be better. But for us mere mortals...
hp - Yes, well, again, no offense to anyone, but those are casual FPSers. If you like Q3 and wanna take a crack at me, hop on irc.enterthegame.com and we'll find a server.