Not possible. Zelda's/Sheik's Down B is hardcoded. It either stays the same, or gets disabled using codes.
And think about it. If it was possible to edit Zelda's/Sheik's Down B, I would've added it to the moveset. Despite what some of you guys may think, I do think this through, and I know what I'm doing.
Um, yes, I think a Peter Parker over Zelda hack is now in order. Joking, obviously
I've actually been meaning to get into PSA for a while now, but part of it is coming up with ideas. That's not to say I don't have any ideas. I actually have a few. It's just the problem is the hacks to base them on just aren't there, and by that I mean, vertexes and textures and stuff. Should I get into PSA, I'd kind of restricted to vertexes other people make. I mean, I COULD make the PSA without the vertex/texture, there, but that makes it lose the feel of, "Hey, I'm playing as *insert character here*". You could always request vertexes, but those more often then not get ignored. I, personally, am unable to vertex, and my texturing is crap, so I can't really make the vertex/texture myself.
So, I haven't checked back here for some time (Been busy and all that). Have we actually made progress, or are we still coming up with ideas? If it's the former, I think we need to set a date or something to where all suggestions for SM must be submitted by then.