Ive just read thru this, and didnt see anything about destruction derby, so ill post an idea, im not even sure if its possible but i cant see why it wouldnt be.
I know theres already DD, but there r no rules or anything. I plat MTA on LAN and what we normally do is wait for everyone to get into a car..321 drive!, or whatever.
The rules are something like; A player cannot get out of the car until its on fire, once its on fire the player has 1 min to either get into a car (even steal 1 (the victim then has 1 min to get another car)), if by 1 min they dont have a car theyre out, and have to leave the DD arena. No-one is allowed to shoot-out tyres, or shoot at all (hopefully it would be possible to disable a users fire key). Also if there are only 2 guys left, once their car sets on fire, theyre out. Obviously the winner is the last guy driving around.
So, to get this to work, i suppose u'd have to wait for atleast 2 people to enter a car, once that has happend, there should be 5 secs to wait for other players (maybe each time someone enters a vehicle its another 5 secs, or the time gets less and less), once that timer has gone, a message should be displayed "3...2...1..go!!" (If its possible,the users keys should be disabled until "go"). Then if a car sets on fire perhaps a message is displayed saying "Get out quick!!" or whatever, then once a player has left the car a message is displayed "You have 1 min to get into another vehicle", and their own special countdown timer. If they fail to do so, theyre teleported outside.
Well thats basically how we play it. Perhaps you could even get power-ups for ur car, like gta2