How about if you are underfire when you log out it's an instakill? Maybe the same mechanic that controls direct communication could be made to work with this? I'm not sure how hard the coding for this would be. But, stopping people from bailing on a fight would be good. As for loot hoppers, easy fix. All loot is removed on spawn in the server within a certain distance. Big enough area to annoy the hoppers and make them less likely to do it, but not so much to effect other payers near the area that have been playing. Maybe 200 meters or so.