I was thinking, decrease the size of the world map representations of some towns.
Baron: 4 tiles
Toroia: 3
Mist: 2 (and I think only one is ever used, because it is cut in half after the earthquake)
Agart: 2
Mysidia: 2
And, saving the best for last, there are two tiles at the base of The tower of Bab-il in the Overworld map that are triggers, but are completely unreachable. I looked at their data, they're not even event triggers - they're entrance tiles. One for the Giant's mouth (B5), and one for onboard an airship (C0)... really have no idea why they are there, but they are seemingly expendable.