I guess it also depends a lot on the car. For example, a real Spec Racer Ford behaves this way: I you are near to have a spin slam on the throthle very heavy and you save it (this was said by a real driver and instructor in iracing forums), but maybe in other similar cars this doesnot work. I dont know how behaves the real F1600 .
This is correct, because this way you are transfering load to the rear tyres, so you are having more grip. If you apply too much power (in lower gears or powerful cars) then the car will spin because of throttle oversteer.
After reading this interesting thread I tried the nkPro 1.03 .I spent some time in tuning force feedback parameters, and I get the steering torque to behave the way Todd says: increasing strength up to a point, and then the steering feels weaker, but not a lot weak, only small drop in force. This decreasing point seem to be the maximum point of grip and also the sound of the skid is present.
So it should be very close to real, however I have not a real racer so i am not sure.
I have not tried differents caster values yet. If I understood well, the more caster the less drop in force feedback when maximum grip is reached, but more overall strength.
Regarding autoclutch in strong brakes cars: you can skip gears, ie 6-4-2, or 6-3. It takes practice and have some risk of over-rev (throtle blip is needed), but it is possible and i have read it is common in real racing.