Changing models from one to another to delete your obsticle.
Like the vault door in IF to old IF, like to a chair. or fire.
Possibly the gate to Hyjal.
The door to Caverns of time.
Greymane Wall.
Uldum perhaps?
Maybe even the door to Grim Batol (I just looked again at Grim Batol at WowWiki.com, theres something new there I didn't see before. Its possibly a future new area.)
Im pretty sure there are other areas, that this could be benefical.
Now... To search through the 7818 .m2 files in the model.MPQ... Hints welcome.