Nice list, I agree with most of things (I dont find some of the mentioned things importnant). However, I think I can add some importnant things -
1)Put some rocks, holes and other obstacles on stage. I never saw rally game where you must be carefull to not destroy suspension. While in real life, you cant cross those things in high speed so you have to slow down.
2)I know it was kind of mentioned, but Ill try to say it more clear - More noticeable wheelspin (through ffb, sound) because of this RBR is still on top, the wheelspin feeling is just great here.