I'll try not to copy the notes from GTS, but essentially, if you want the car to have strong oversteer, increase the Acceleration Sensitivity. Personally, I find it gets in the way of everything else (other car settings), so I tend to tone it down. Ideally, set it to the limit where the car stops giving you too much oversteer; sometimes that could be 20 (FF Cars), sometimes 5 (OP MR/RR cars). This has the strongest effect of all the LSD options.
Braking sensitivity comes to life when you are in the braking zone. If the weight your car isn't centered, you'll feel the car wiggle and tend to slide one way. Making this stronger will help stabilize the car in the zone, but hinder its ability to turn in while you trail brake (braking late into a turn). For GR.1 cars it's not as extreme as they tend to have good downforce to help stabilize the car. This can work hand in hand with the Brake Balance (optional).
Initial Torque, typically is needed on FF cars where you want to help generate torque to help the car turn in. Most cars in GTS are FR/MR so a low value is pretty common I think. HTH!
Jerome