OK . . . well I first decided to read through everything, thinking that would be a good idea. And it was at first, because I put together some nice suggestions around pages 2-3. But then I started to forget everything around the end of page 4. Well here goes nothing.
I'm putting together what I think are the best parts of what others have said, and a couple of my ideas.
1. You should be able to swoop whenever you have someone targeted, and you should swoop only when you have the button held down. (personally I think it should be right click, since swooping isn't the attack, but I know it'd be wierd to switch now).
2. I agree with the longer you swoop, the more damage you deal idea. However, there should be a warning when you're targeted, because if someone who's across the level from you comes at you, and you're busy with someone else, you can get creamed. Perhaps give incoming swoopers a little tail or a "glowing" blip on the radar?
3. When two people swoop at each other, I think they should come to more or less an equal outcome. The main thing should be in the recovery. The person with the higher PL percentage should recover faster. For example: maximum recover time is 3 seconds, meaning if you had 0 PL (which wouldn't happen, since you'd be falling, not swooping) it'd take 3 seconds to recover. If you had 66% of your PL, you'd recover in 1 second. An idea to play with.
4. When you block, you should probably be knocked back a bit, but not spinning out of control, just pushed back (maybe the swooper can continue the attack and smash the blocker into a wall!)
#4 just gave me a semi-offtopic idea about blocking.
When you're holding block, left/right click change into defensive moves, like a kick-away (for someone who attempted a melee) and some sort of energy . . . thing. I can't think of any examples. Just an idea.
*When you let go of block the moves should obviously go back to what you were using.
Damnit, I know this isn't all I wanted to say. I wanted to re-list more of what was brought up, but I can't remember it anymore. What I originally had planned to say was simple, since the potential patch was to be simple. I got carried away.