I think is good idea to put "Full lobby start" optional feature in race lobby, sometimes i make race like "no limit" and then minimize game while i waitning for players. If there would be option like that, I wouldn't have to check if anybody join and then If the race starts player will hear the engine sound (or music) so then he will know he have to alt+tab.
It's also good to put simple sound signal when someone joins or leaves lobby... and another one for full lobby.
It's also good to put simple sound signal when someone joins or leaves lobby... and another one for full lobby.