In SM you can mount on serpent mounts, though you will get dismounted almost instantly.
Disconnect and reconnect your internet connection repeatedly, as soon as you mount up, to be able to fly around in SM for a while.
I have tried this in a couple other dungeons, but did not find it possible to copy this process in any of them. (It did work in the scenario "Dakker in the Dark", though)
Feel free to attempt this in any dungeon you'd like, and feel more than free to leave a comment, telling whether it worked or not.