I ams sure it has been explained before, but search is failing me. How come a strut suspension on the powered wheels of a FWD car gets a weight break but a strut suspension on the powered wheels of a RWD does not?

The problems inherit with the strut suspension are consistent no matter which wheels are driven.

What was the percentage diffference/standard deviation from the norm of the class to warrant a torque increase/decrease adder?

Also why are all these adders only applicable to ITR but not ITS-ITC?