Suggestion for Swifty:
Make it so when the crouch button is held it plays a dive animation and your fall rate is increased.
That's pretty much exactly what Bot Man suggested, just slightly opposite.
Though now that I think about it.. that would be rather easy to do..
I could just have it apply a small amount of downward force while you crouch, and also change the animation it plays. :o
Also, I should have posted these ages ago:

Some design concepts that I've come up with FOR THE SWIFT DRAGON'S WINGS during the past long time ago.
There is much room for refinement, I know. Suggestions?
Also updated the poll..