I discovered a number of ways to get outside the map with Great Weapon Fighter. Other classes may be able to do this, but I have only tried GWF.
Picture proof:
http://nw-forum.perfectworld.com/showthread.php?336042-People-say-there-s-no-reason-to-play-GWF
Now this isn't gamebreaking in the least, but I just thought I'd put it out there. If one of the staff wants me to either show them the places ingame or provides me with a picture of an overhead map of Protector's Enclave, I'm more than willing to point them out.