It would be nice if the game lobby could play a notification sound when the game you have currently joined is full and/or a button that triggers some sound on all joined players PCs to get them back in game and on their chair.
It happens quite often that a game is full and people don't x up because they are afk or tabbed out and don't notice.
This could help reduce time spent waiting for games to start,
If it is implemented there should be some spam protection like playing it max once per 30s.