I understand that you're trying to keep things as fun as possible, without having to complicate it all with hundreds of rules, but I think that taking some time and writing a few guidelines wouldn't do any harm to the competition, Bunder.
Using Neto's accident as an example, in most series around here, drivers are told to stay on track after an incident until the race director decides what to do (e.g. tell them to spectate or call a safet car). In this league, there are no rules regarding whether the driver should clear the track immediately or not after a crash.
With that in mind, could you consider writing a short rulebook covering the basics of racing before the next race? (e.g. whjat to do when crashing, when to talk and not to, can we rejoin the race after spec'ing? et cetera)