We get frequent requests to "add a street" or a house number to an existing complex delivery map, when the map edge just missed that address or needs to be slightly bigger to include the other side of the street. Currently you have to keep creating new maps over and over and hoping you got all the coordinates just right and didn't mess something else up.

This should be easier to grab a dot/corner and pull it in or out to cover that area you need properly (ie zoomed in a lot on detail map).