I have found MaemoMapper to be a little confusing, and I consider myself fairly a savvy user. I think that using some of the screen real estate to put some basic buttons/shortcuts on the left or right side would be excellent.
Some examples of these shortcuts might be: (Favorites) - Ala Google Maps, tap it and you get a list of common addresses you use. (Map to from GPS Location) - So it can map to an address from where you are with just a few touches. (Map from Address to Address) - With easy access to favorites.