At high speeds (over 100 mph) you want the steady state balance of a vehicle to be slightly understeering. Not driver on the planet (including Shuie) can drive a steady state oversteering car at high speeds - for very long. Most race vehicles use aero to achieve balance at speeds in excess of 100 mph.
Since autocross is a low speed event and is mainly composed of transitions, you want the car balanced more towards oversteer. On a FWD car you go to extremes to achieve this:
1. 1/4" to 1/2" toe out in front.
2. 0 to 1/4" toe out in rear.
3. Move roll stiffness to the rear.
4. Extreme air pressure differences front to rear.
5. Rear brake bias.
If you ran these specs while on a race track the car would probably be undriveable at anything over 70 mph.
