Dev, please will add "Request or accept to take over car" to the server of settings. For example, as "allow mid-race join"(yes\no), "allow car reset" (yes\no).

Wouldn't harm such option - in races/events,where driver swaps are not allowed,noone has to monitor such activities.
Allow driver swaps: yes/no

Yes, +1 for Event races!
Eclipsed, Thanks.

an InSim could take care of this though. Not prevent it however.. Hmm..