I hate to bother anyone with this, but it seems people here have the knowledge I'm looking for. I decompressed some support files with FEAT, and got a .txt. I edited the .txt file, but now I don't know how to recompress back into a file that can be read by the game. It seems the people that made this know, since they changed character names, supports, etc.
And also, would it be possible to add more accessories to the accessory shop, like Nyx's veil, or Adventurer's hat?