Have you thought about a "Concede" button that could be used to withdraw from again when you have to be away from your computer or when the end is obvious? Sort of like chest when you knock over the King to end the game.
We have all seen games that end up drawn out because of a "family emergency ...
Hell, I knew they were already busted. I put that in my report. Why were they allowed to start join another game? They are stealing my points. If they are busted, why are they still playing?