I am sure that it has happened many times to each of you that when a noob quits an AI takes over for him. That AI then precedes to own you.
I think there should be an option on the game-setup menu that allows the host to choose what happens when a played quist or falls out. There should be opitions that when a player quits they; completely dissapear like they were never there, stay there but cannot move (defensive only), or are replaced by a specified AI. The game-setup menu in Sierra's Empire Earth 2 is a good example.
Sorry if you have already heard this but I needed to say it.