Allow a "Currently in x games" Lobby Filter
Allow players to apply a filter on their created games (similar to bootrate or level filter), to filter out players who are in more games than their determined limit.
This would be useful, because players who are in too many games concurrently, usually play really slow and oftentimes their play-quality suffers, since they're not as invested in the game as those who are in fewer games. So they often play carelessly and surrender easily and may also be less communicative if the game requires eg diplomacy.
Some players, like me, find that annoying and prefer quality over quantity and thus would love to be able to set a filter like that, to ensure focused, invested and engaged players.