AWESOME!!! but I wish that they would make a new expansion that would allow you8 to change the diplomatic situations for custom nations when you on a custom nation only map, such as allowing you to create personal unions, vassals, marches with you custom nations and allow you to set them in alliances or at wars, I think this would be cool because I Love creating custom nations.
That would be an interesting idea as a payable expansion to the nation designer : a sort of world customizer. It could even be compatible with ironman if there were some kind of points system linked to how you can change other nations situation.