Log off is always a delicate part of game balance, since on one end you do not want the player to be punished for attending to a RL emergency; on the other hand you do not want people to use log off as a get out of jail free card. For example, in the pvp centric, high death penalty mmo eve-online, the log off mechanics are still being tweaked 9 years in and can still be exploited to get out of the heat. I think with this anti-game of yours, you have a unique chance to experiment with how players react to really harsh log off mechanics. These changes would simply risk driving away too many players to be acceptable in a regular MMO. As it stands right now, panic alt+f4 will save you from a zombie horde 100% of the time, and save you from other players too as long as you have taken no pvp damage. Most importantly it allows you to escape when cornered, which I believe is a very important issue. It affects immersion greatly and gameplay as well. I wonder how the game would be like if your character remained persistant for a certain time after logging out no matter what. This would encourage finding safe spots to log out or players protecting each other as they quit the game. I think it would be a powerful boost to immersion and all in all interesting from an experimental point of view: has this ever really been done in any other game?