Why Ivan? Rockstar wouldn't care, last time i checked (i could be wrong) Rockstar never helped the MTA team with anything except with maybe a few words of encouragement, but nothing more.
nevermind Ivan's post there
I read about your idea Strepto, and I think if all the car's handling information was stored server side and automatically downloaded to user's clients, it would allow the server operator to set vehicle handling for all players simultaneously, and it would be harder to exploit.
The server could contain "sets" of handling information, so if a player buys "BodyKit1" it would download that handling file/handling information (for use on that server only) It may also download all this information before hand, when the player connects.
The only problem is that GTA:SA wouldn't use that information unless it was restarted. So players would have to restart GTA just to get the handling info to work. And then if players wanted to leave your server, and join the "modless" PartyServer, players would have to restart GTA again to allow the client to be verified while connecting to PartyServer.