I know how annoying that thing was in Eden Eternal. I have a different idea. There were a lot of problems in Mass Effect 3 multiplayer where people would join the game, then go hide in a corner and do nothing, leeching experience and credits off the other players. What Bioware did was enable a timer that if you became inactive for two minutes (that is, not moving or shooting at all) you would be kicked immediately from the game. Two minutes isn't a very long time for an MMO, but perhaps five minutes without moving or talking earns you a kick? But make an exception for when a player has a shop open, because that would just interfere with selling items and you can't set up a shop in a place where you can autofarm anyway.