Is there a way I can use the Swapmaps library to have the game load a .dmp file, then have it save the map when the world closes like it does then be able to load it later?

In other words, I need to be able to give an id to the map that loads so I can save it later; because with Swapmaps all I can see to do is make a new map and then save it, but I can't save the existing map :(