Maybe this has been suggested already, but don't blame me for not searching the whole forum.
Anyways i thought it would be good if host would have the option to disable restarts. Maybe this would force people on the server to drive more carefully on the first laps...

Don't know what's the limit of the "no restart after race starts" option, but i'm quite sure it's much more than a typical everyday LFS race lasts.

P.s.: Nice avatar

this is already in the game. can't disable it per se, but you can set a time limit that the race can't be restarted after the race starts, and set another limit that the race can't be restarted before the race ends...default for both is 1 minute i think.

These commands help server admins to manage restarts:

/rstmin=X :no restart for X seconds after race start
/rstend=X :no restart for X seconds after race finish

And this one is very useful for preventing disruption too:
/midrace=X :no / yes (Join during race)