Safetycars:
When a safetycar is being deployed the lapped cars should be moved ahead of the leaders, and at the "One to go" signal they should be able to start racing at the half way mark of the lap.
Races:
More road races.
If possible we should have a 12 or more race season, and include configs.
I feel that nothing else need to be changed.
One thing that would've been cool to try is Fixed setups, but I guess its quite hard to make that happend. (Or impossible, I wouldn't know)