So there's a cool hack shown in this video:http://www.youtube.com/watch?v=pNw9z2Q6OW4
In the description is a download link:http://www.uploadable.ch/file/ACDETeQcA9Dg
Within that downloadable archive is 'SoHack.ups' as a file.
Apparently that is a hack for the Japanese version of Star Ocean for the Super Famicom. It allows for the main character (Ratix) to be switched out of the party and some other fancy programming wizardry (even works in battle!).
I stumbled across this while going through some old posts on the GameFAQs forums and a brief mention of this hack was made.
I don't see the hack listed on the appropriate game pages so I was hoping someone who knows Japanese can go through the archive and translate the various text files and readmes present within. All I see on my system are garbled ASCII characters since I don't have the proper language installed in my Windows setup.
I'm also unsure of what the other hacks present within that archive are for. Perhaps if someone with a bit of programming talent wants to look at the patch that has been done, we can get a full breakdown of the changes that were done and replicate those changes to be compatible with an English-patched version of the game.