So this suggestion does come from me breaking resize but would be an interesting feature. The idea is I resize an image to be huge, say 160x160, to make a large area like a city. Then when I am done building this massive image it is too big to export so I resize the master image into sections (tiles) and export those smaller images.

This is very useful to keep a set of close together maps consistent and to get a better overview compared to jumping between maps to make sure they are consistent.