Hey, I just found a way to get "behind" (into the gold vault) in Dalaran bank. You will need a vehicle mount (mechano-hog / mammoth) & a bit lag (I went to youtube and opened a few videos to get my ms a bit up) to be able to do it.
Video & Screenshot:
[ame="http://www.youtube.com/watch?v=uxYbJXzIFq4"]YouTube - WoW Dalaran Bank Gold Vault[/ame]
thanks.