I've had issues with having too many maps before, pff.
I can see where having a larger ramp, or the boundary limit extended would help, I think that's be a nice idea.
However, what I've done to fix this problem for myself is simply go into FeralHeart> Exports and remove the .FHM file of the maps that I don't need/go into anymore (granted you can find the one linked to the correct map you wanna remove pff- at least I think it was that simple, I don't remember rip). If you wanna keep the map, but are not gonna use it, you can just make a folder to hold all the unused files.
Buuut if you just have so many maps that you wanna keep in the game, then, I don't have any suggestions ^ -^;
Nonetheless, I do like the idea.