FF3usME: Problem to export FF6's script

Could the program be updated so the bottom window would display things properly, or would it be a very difficult task?

No the source code is not available. The only one who can do this is the author, Lord J. You can write him a email though, his address is in the "Help" or "About" section of FF3usME.

As for the FF6j script, I've never seen it anywhere and google has no good result. I always have been bad at searching on Google Japan, so I'll leave this to you. Good luck!