Snes9x.com

Thanks, I didn't know TASvideos had different emulators.

You have to press A for 3 frames or less while not moving, to be exact. But it is possible to do a low spin-jump at a speed of 23 or less if you press it for only 1 frame.

I am a smw TASer and want to use v1.43 because it creates less lag and desyncs less, but I can't find where to edit the hotkeys eg. savestates, frame advance.
Could someone please help?

Try http://www.smwiki.net/wiki/Category:Levels
It has a description of every level as well as all the level numbers.
Or just go onto Lunar Magic's Overworld editor and press F1