You could put a Raptor on either side of the leviathan, and then deploy it so those flaps on the left and right stuck out. They wouldn't clip properly with the raptors, so the raptors would be underneath the flaps and could then fly up and fly the leviathan all around the level.
Since it's hard to shoot from a leviathan in midair, this was mostly useful for putting it on top of really high places. It was awesome.
Damn! That does sound like fun!
I only wish that you could toggle the ability to do this on and off, instead of modifying the physics permanently to remove it....
And it sucks that I never saw this anywhere. Know of any good servers with people who aren't just retarded and dont know wtf they are doing?