Many people have said it, and yes, they don't need to be removed, adventure mode wouldn't work to place air strikes, and barrier blocks may spoil the map. You should just remove those spots completely with minimal damage to the visual affect, and keep those spots boosting places only ( being hit by a zombie ) But I support that there should be a change on these maps.
Obviously if they can get to the location and annoy you, you're able to get to it. No support, just adds more fun to getting the people.
I do not see how it is fun from glitching a game to get to a advantage... I guess that is your opinion.
It's not, but it's fun to find new ways to play the game, and if players so choose to find exploits in the game, I'd say it's rather fun to find ways to counter it.
I see your point of view... I just wouldn't count glitching as a new way of seeing the game, I'd count it as cheating.