Being that the AI is geared towards driving the racing line and braking only for corners, a thought came to mind to maybe help fix their temperament.
If anyone has ever played NASCAR Chase to the Cup 2005 there was a feature in career mode called Rivals and Allies. If you race clean with another driver, he would race you clean or if you raced dirty or aggressive he would be aggressive right back. I think this could really change the game drastically for the better. Since most of us are constantly hitting cars you would eventually have a full field of aggressive drivers that would be honing in on you and the other AI