More than 2m you really need optimal settings and LEDs on max. current limit. A large mount and a zoom on the web cam could be helpful as well.
And a real good daylight filter is indispensable. Forget the floppy-filter, it will not work.
I think, SFH485P LEDs are good enough for this.
And if i can use freetrack in any First person shooter to control the look scheme instead of a mouse?
For me it missed some reactivity and precision. But give it a try...