I was playing around with the J2e translation the other night, and was surprised to find that there were a plethora of options not available in the US version, such as:
Remember Cursor position (Why, Square? Why!?)
Custom button mapping (you can, say, map Start to open straight to the item menu, etc)
something else (can't remember what, as the above two are the most notable of what I saw at the time)
What are the chances of these extra Customizer options still existing somewhere in the US rom? I'm quite interested in restoring the "remember cursor position" option if at all possible, as it's one of my preferred options in the newer entries of the series.

Also, are there any documents on hacking the Customizer menu? While I currently lack the skills to do a whole lot with such information, I'm very curious on how it works so I could play around with things like trying to merge the battle/message speed option into one, or trying to make a music player like one found in the early Sonic the Hedgehogs/Street Fighter 2 (which just shows the hex value of the song pointers, playing a track when you hit confirm.)