Dwells – Unique dwellings for creatures on the map, levels 4-7.

should they be in the map editor?
because they aren't there.

no, and they won't be. Instructions on how to add dwellings to the map are described in the 'readme.txt' file (all in the uploaded archive), it's a bit cumbersome, but it works. If you find a way to make them appear in the map editor in the tabs on the right, let me know.