Multi-Party mode

The solution might be to adjust all exits to update the parent map, or if that isn't possible (haven't opened the editor in a while) then perhaps an event plane could be applied over the entirety of exterior locations to update the parent map... that would fix it even if you switch parties.

Another complication such an idea would present is changing the party; whenever that menu is called it is done so by event and each party is manually placed on a map; you'd either have to require all parties be present at the same time (like the gameboy release did with Dragon's Den), or... well, I'm not sure how else you'd go about it.