I also wouldn't want to be required to take mandatory driver training just to play the game. Even though many people think it wouldn't be much of a hassle, I still wouldn't be for the idea. A lot of the problems discussed here can be dealt with through education and a better standard of what's acceptable and what isn't.
I think a better solution might be replays or videos that cover the rules of racing. Videos are obviously more customizable but replays are much smaller in size and could be included in the LFS download. There could be multiple different demonstrations that cover each of the common problem areas such as passing, blue flag, yellow flag, black flag, pit speed limit, cold tire issues, etc.
I know that quite a bit can be done with replays using InSim, such as changing camera position, changing target car, etc. Perhaps something like this could be done with a few replay files and a number of scripts. I think that if something like this is done it really needs to be included with the game. There are far too many racers who try the game but never visit the forums or who won't have the patience or bandwidth to download 50MB videos just to learn the rules of racing.