Re: afk detection
Well, they can win.
It's not a terribly huge problem, but they do make you to hop to another server room thing every once in a while (eg. if there's 3 players in a room, one of'em afk). Would be like, handy.
Editness: Oh, and I suppose it'd be better to detect if nothing was done during the first turn of a match (no joints manipulated and no pressing space) rather than checking if one doesn't press space during the replay of the last match. If the replay is the awesomeness, might be noone wanna space it away'n stuff.