This idea was brought to me by a friend, and I said I would post it.
When joining as a sub from the main page, possibly a way to review the roster of the current game prior to making the decision to join. Looking for people that you know are "toxic" and trying to determine if you are getting yourself into a lobby that is failing (say, for example, misconfigured server.)
I pictured this as a pop-up frame showing current score, and a small version of the lobby join page showing in-game and out-of-game.