I discovered this myself. Im sure others on the PTR have realised that you can wall-walk in this way.
I cant be bothered with embedding or editting so here is a crude link to a crude clip:
[ame=http://www.youtube.com/watch?v=LF6ukrIUdf8]YouTube - video unrelated[/ame]
PLEASE NOTE: This is not the method I use for wall-climbing. I never managed to achieve any real climbing using Levitate.
I have a way to wall-walk vertically up almost any mountain or wall. If people appreciate this first wall-walking discovery then I will release the full version.