I would love there to be a way to combine different map versions. Essentially, I want to be able to restore a map without overwriting the current map. Having the option to take a saved map and simply add the areas on the saved map to the current map would be great.
As the maps are tweaked/re-mapped for different areas, I have come to find one version of a map mow one area better than the other and vice versa. In these situations being able to take Area A from map A and Area B from map B to make map C would be great.
Right now the only option is to completely overwrite the old map. Having a checkbox to let the user decide if the current map should be wiped or just overlay the saved map onto the current map without deleting anything would be all you should need!