One feature that I have yet to see in an F1 game is getting stuck in gravel traps. Its a feature that would add extra realism to a game, and probably be rather simple to code too.
Now some people might be saying this would destroy gameplay, but it wouldnt if the feature could be enabled or disabled. The hardcore fans who want every last drop of realism could turn it on, while the people who want a quick race could leave it off so they can drive out of them.
Geoff, if your reading, GP5 please