Allow groups in Custom Matches to return to the lobby after a game (instead of auto-requeuing)

My friends and I often like to play private matches, but needing to disband the group and re-invite everyone when we want to switch up the teams (or tag in a spectator when we have an odd number of players) is a pretty clunky experience.

Perhaps a better alternative would be to send the group members back to the lobby screen after a match is completed (ideally with all the players in the slots they previously inhabited). I believe this makes more sense as the default post-match behavior, and perhaps a "REMATCH" option could be exposed in the post-game summary--similar to public-matches--which _would_ automatically begin a new game with the same teams, should the players (or at least the host) choose to.

Maybe a sidenote: I'm not exactly sure why customs auto-requeue in general actually, as that doesn't happen in public matches from what I recall- and it also means that we need to do the re-invite dance if someone needs to take a pee-break etc., unless we want to wait through a lopsided match while the player's AFK.

I'll feel rather embarrassed if I'm illiterate and there's been a setting for this I haven't noticed all this time.