AAK Accelerated Arial Kick
Zipping sounds kinda lame, so I think this would work best.
Alright, I checked, and the second-place runner uses a AAK in the start of his run. Honestly, I think we should allow it for glitchless. Playing mario combat without AAK would be like playing American Ninja Warrior on a wheelchair. Its not really a "glitch" either, since its just a kind of mechanic that, although broken, is still kind of just a part of the game.
Think about bunnyhopping in source games - bunnyhopping (in whatever form it takes) usually is allowed, even in the glitchless categories (I.E. Half Life 2). Its more of a "trick" than it is a "glitch".
So, just take out all the other glitches, allow AAK
It's not a glitch. It's simply taking advantage of a game mechanic. You're timing your jump to preserve momentum. The game is still working as intended.