I'd like to see different rule options. So you maybe racing FOX but the server is running F1 rule set. So there are preset rules to follow. In the Esc menu screen you can get the "Rules" button that gives the run down of them.
Just find it annoying and frustrating trying to race realistically only to have some one ignore pit excite turn out and you have to practically dive off the track not to hit them.
Would also like to see some sort of penalty for blocking. In F1 you get one blocking move. I was racing in Blackwood, was clearly faster then the guy in front of me by 20-30 mph. Yet every time I tried to make a clean pass the driver would turn sharply in front of me, causing me to slam on the breaks. Doing it once Ok, thats racing. But doing it 3 or 4 times in a row when the person behind you is clearly faster, not even fighting for the lead. (Was in about 6th at the time) that is just being malicious.
One thing I'd really like to see and I could be a minority on this one. A Rule that after the lead cars finish the race they have to do a cool down lap then pit before they are declared the winner. I lost track of how many times I might be a lap down or a few places behind the lead two cars, only to have it when there race is finished they slam on the brakes and stop in the middle of the track, or are doing dough nuts. When not everyone has finished the race yet. I've crashed and spun off because of this. A few times lost my position because of this. I lost 3rd once because 1st and 2nd were stopped on the track because there race was over, when I was still trying to hold third. :/