The Ability to separate controllers per car, would be great. So u can set your wheel to be used as an f08 (f1 car) by using the butterfly trasmition. Or use your Gt with the stick... if that makes sence.
Basically, make the ability to have car specific controles.. if you wanted. Or u could used your preset, default ones.
Just load up lfs with Tweak running in the b/g, then select one of the 3 demo cars. Stay in pit mode. Alt-Tab, and edit your settings and press apply. Then Alt-Tab back into game and have fun =)
Although you have fixed your problem, I must say to others that I had to acctualy uninstall lfs, and re install it (or just delete teh config file/s) b4 i could get good fps.