
Originally Posted by
Triceron
There is
Mouse3 (middle mouse/scroll wheel) lets you climb on any surface. Press it again while you're on a ceiling and you'll drop to the floor.
Problem I had with it was the camera disorients you from dropping down, and I'm often spinning around like mad trying to get a fix on my target. I wish there was a way to fix my camera on the target, either with headtracking or something like L4D Hunter's Leap attack. It's hard to melee an opponent that's shooting you while you're on a ceiling.