From what I can tell, this isn't a feature that exists in this particular plugin, but it would certainly be something that would be nice to have. I'd like to be able to take all the map points I set for all our posts or a group of posts and display them on a larger map.
For instance, we have a person who will be live-blogging a trip across Asia and this program will work awesome for single posts, but it would be nice if we could display a kind of master map with all the points he had travelled to. Maybe based on categories?
Just a thought.