Random battle theme

It does bring up some questions though, like if the original save games will work, and if FF3USME will still load up.

The srm file is a different file and is not related to ROM size so yes and FF3usME can expand the ROM so FF3usME will work.

Good to know.

I just had a random thought, but am unsure how possible it is:  having an overworld battle theme based on the battle background (eg, deserts, grasslands, and forests play an overworld theme), and have the rest of the backgrounds play the default theme.  That would actually be far better than being stuck with the same theme throughout the whole first half and second half of the game.