There are probably all sorts of solutions to this (short of building the feature into the software). My setup is my barrier (and I'm too lazy to dig into the programming and hardware mapping aspect). I have 2 Evolution Playseats with G25 wheels/pedals/shifter assemblies. My PC runs to my Panasonic 50" monitor, so a split screen is ideal. Colin Mcrae does it beautifully and my little nephew and friends love sitting in front of the same screen going head to head. Maybe one day LFS will release something like this. OR one day I can just win the lottery and buy my own open wheel formula car and do it for real!
One thing I did notice last night when I tried this...
I connected my 2 G25's to my PC and started LFS, went to the OPTIONS menu and in the CONTROLLER area, at the top right of the screen, in yellow text it stated that 2 controllers were detected. Even if I calibrated and assigned axis and buttons to both, there was no where to go to select a second player offline.
Sure would be sweet if this could be added to the software...in my opinion anyway.
The 2 green LED's between the L2 and R2 buttons will both illuminate when running Gran Turismo 4 on PS2 indicating 900 degree compatability. The wheel works ok on LFS but I was just wondering if it is really supporting 900 degrees