Feathering Tool for maps

Idea for maps:

• A feathering option for edges

A lot of the maps people make look pretty bad because they don't match as they're layered on top of other maps. If there was a way to feather the edges of the map image as it neared the edge of it's border, it can make it so map makers don't have to go as far as they'd need to go to make a map look clean, and some map makers can still make their maps look presentable even if they have trouble with the polygons (for example, the world builders who only play and build games on their phones).