This may be beyond the scope your aiming for, but I did see integration with a few other mods so I thought I would try.

Cadmus is a well crafted land claiming too, where land is claimed via a map. What I propose is to allow claiming through the Map Atlases map.

On a smaller scale, and probably not as heavy, simply showing region borders on the Map Atlases for Cadmus would be spectacular. I believe this one is more valuable to most people.

Cadmus, for reference.