This is a guide for anyone who was wondering how to do front-flips, backflips etc. on a flying mount. If anyone finds any new tricks that aren't listed here... Please let us know! As of now I only know of 2.... The front and back flip...
Enjoy:
Front-flip & Back-flip:
Press escape to go to the game options.
Go to key bindings.
Scroll to the bottom until you see the "vehicle controls" section.
Set the hot-keys for aim-up and aim-down to "~" and "tab" respectively...
Now, while flying on a flying mount (or swimming in water without a mount)..
Fly forward, then, press and hold tab, or ~, and you should start flipping...
Enjoy!