Now, I've only really gotten into KH1 and CoM (those are the only two I own, I plan on borrowing KH2 in the next few months.), but here are some moveset ideas... (forgive me if my BBCode is off, first forum post here.)

Final Smash: Ars Arcanum
Dash Attack: Sliding Dash
If you could make the roll dodge look something like the Dodge Roll ability that'd also be pretty awesome.
Up-B (Recovery): Possibly ground only? High Jump - Hmm... if it were ground only, though, would it be better to make it so that Sora can still act after using it?

I'm still very new in the hacking scene and haven't even touched on PSA yet so if some of this is impossible, I apologise... just thought I'd throw in my two cents and support, though.