It's also funny that additional unbalanced loopholes are thrown out there as some sort of reason to not fix the one that is being discussed. These examples don't make me want to give up on fixing the loophole. They just add on to the to do list.
Rooftops of buildings were mentioned..
Vultures nesting on rooftops would be one way to make things interesting as well as the return of a vertical wall climbing zombie. Unless you prepare that rooftop ahead of time you will be fighting off climbers who can follow you up there.
Treading water was mentioned..
I like the idea of a water based enemy or just make it so zombie dogs can swim. Someone (Odetta?) mentioned that changing wood blocks to be able to be placed and to float on water would be a great way to give wood building a place in the world. Then, no treading would be required. Players could build a floating base with hopefully some appropriate threats to it that could be defended against.
Logging off is always mentioned..
Who cares? We are looking to add fun for those of us who stay to play the game.