This is kind of advanced for a PSP game, but it'd be nice to have the weapons that they use in battle change depending on what's equipped. I understand the need to stick to the original artwork, and I appreciated it, but it felt a little weird whenever I'd stick a dagger on someone who was clearly using a sword.

I know you said it's not for the discussion of new characters, so I won't go into details, but I really feel like they could add a whole slew of new characters. Choosing the "main" characters from all the games really made me feel like I was dealing with the same characters over and over again.

A coherent plot would work better, or no plot at all.

A cleaner menu system. I really hate that I can't scroll very easily through new menus, so I have to literally keep pushing for each and every new item.

Upgrade the command battle abilities. Or include, if only in the form of a bonus, the ability to fight RPG style battles with characters. The weapos, accessories, and abilities are there; it would work well.

Most importantly, I'd like as much new music - as much new music as can be packed in there - and new alternate outfits as possible. There's something incredibly fun about fighting to Crystal Tower or Rebel Army in all of its 8-bit nostalgia.