The most important is the LSD settings. From what I heard from a buddy, from a tech, from Subaru Rally Team USA, is that if you set the front LSD (Accelerate) higher, it'll give you more oversteer going out of corners. This was heard of from the Rally Fest here in MN last year before the Rally in Bemiji MN. Cool, ey?
My opinion on this is that it'll only help in low speed turns where there are a lot of grip as in the WRC and some SCCA Pro Rally courses. In high speed turns, this setting is too much because the LSD is activating, which makes the car sort of push/understeer.
Another would be the suspension. Camber shouldn't be set so much. Anywhere from 0-1.5 is good. You should also understand how the "Toe" affects your cornering while in a turn. Most times the "toe" will "Toe-out" when the suspension compresses (outside suspension). My personal experience would be to set the front "Toe-in"(ex: 0.20) and the rear "Toe-out"(ex: -0.20).
Because in GT2, the roads aren't like the ones where the WRC Cars are running as in the Safari, the stabilizers can be set higher than usual. From 4-6 is well and will help in high speed cornering.
Ride height should also be looked at. In GT2, there is no damage done to the chassis if the vehicle is put through serious corners with ruts. But ride height also has affects on 'if the vehicle will drift further or not'. In my experience, with a lower ride height you can take some higher speed turns faster than that of a higher ride height. A higher ride height also makes you drift further and longer. In the real world, the ride height is there so you can drive over rocks, and uneven roads (Safari Rally).
Dampers should be set to where they'll absorb the spring articulation. The rebound should be set high so when you land from a jump, your car doesn't jump back up. Setting the rebound high also helps when you corner left and right, because it keeps the sides from lifting (suspension dropping) due to a stiffer resistance.
I hope that helps, any more questions, I'll try my best to answer.
FuJi
