Maybe do races on set days and at a specified times where anyone that can be available has 30 minutes to race that weeks specific race and that's it.
That sounds like fun. My times for week 36 were pathetic for the first couple of hours and I was questioning whether I could hang with you guys at all. It took me a long time to get any times that were decent, so I would probably be terrible at the 30 minute race, but I'd be willing to give it a go - it sounds like a logistics nightmare though.
I'd suggest that we still have a regular race for the people who can't do the live race. Since the live race will take up a total of 30 minutes and the regular race can offer hours of entertainment, I think it would be a good idea to have both.
I like the ideas about money limits, I think that has a lot of potential... do I get super sticky tires or the custom transmission and medium tires??
I also like the idea of an endurance, maybe even one with AI cars, but it would be tough to run a clean endurance race. Without the AI, it would be tough to have a replay.
More suggestions:
Maybe a cylinder limit, or a weight limit (min or max)....
or a horespower limit as previously mentioned.
Could also try a stock race.
I like the sim tires idea.
How about a hot lap at complex string? (maybe that's been done)
How about a top speed limit? (transmission governed)
How about a fully specified tuning setup that is designed to make the car rediculously hard to handle
Maybe just pick a tough car to handle like a lotus or a TVR in sim tires and specify no TCS or ASM.
How about specifying a horespower range? (500<hp<600)
What about a competition with different tracks (everyone picks their favorite), maybe divide the time on the track by some normalized number assigned to each track (Time Trial numbers or something).
I like the idea about using the wet track.
What about a rally race? (<-I would so totally be last place)
How about going around a track backwards that isn't suppose to be done backwards (like monaco or laguna), and then having to do it forward (through twice) after crossing the finishline backward?