I think it's a great idea. It happens something similar to me. My loadscreen takes some 10 to 13 seconds (first load after turning on the PC), meanwhile I am already connected, losing seconds of ghost mode. The solution to this is to load the game previously on SP, so the next time, will be faster. Obviously, I never quit the game on the middle of the road, so accidents don't happen to me. Anyways, it's a better idea to change from seconds to units. So more problems will be solved, like @Glada_Laxen situation.
Regrettably, it's easier to improve a better (efficient) system, rather that teach players. I mean, TMP can make videos or reports of the correct way to quit the game or make saves (a very easy thing to do, I know). But there'll always be people that wouldn't see them and cause the same problems that nowadays we're argueing for. Thinking of an official rule, so someone could ban those people that don't learn would demand a harder work from the Game moderation team (see if the situation deserves a ban or not, or if he was corrected parked or not), so again: it's easier and more efficiente to improve an existing system, so more problems will be solved.