i´ve searching with same suggestion but i dont find some one. my suggestion is to put a little outpost without zombies in it to make some teams or just for trade some hot items. so i think its a good idea to make the game a little friendly among the player. so just made 5 buildings with a wall around and 4 towers. all player in the base are save from zombies and firendly fire. so sometimes a horde want overrun the base and the player in it must defend the base (brings some chilli in game^^) so what is with the player outside the save spot? at this moment that a player see the base he cannot kill anymore.. so its also a good play on the top of a hill or in the valley below so what we have now in the game is that the player shot to hurry to each other. sry for my bad english.. i´m from austria/europe but i hope u understand my suggestion. greets Gr33n