I was pondering myself if a file per empire + 1 for all left-over kingdoms would be a better solution.
But why would you manually change it? It is not really necessary at all and takes away the possibility to do mapfiller re-runs :huh:
Well, one might have a certain area which is completely fleshed out de jure-wise, and from that point one would only modify creation conditions in said area. At the same time there can be other areas where changes are still being tested. It would be easeier to backup the file of the polished are, twaek the other in the mapfiller and the override the regional file with the backup than doing the same inside the very same file, selecting and copypasting