Hi Andrew,
first of all, many thanks for developing the space terrain
Also I had the idea to use multi-tiled planets while creating this mod, because, as you, I found out the one-tiled problems. But testing a bit with multi-tiled planets I got problems with the "edges" of the planets. I postet a picture
here , showing that same planet-sizes could have different appearances, and I wasn't successfull to create a multi-tiled planet (e.g. 4-tiled).
Maybe you will have more luck, I'm looking forward to see a multi-tiled planet
But pay attention, that you could always use one amount of tiles for all space-objects. (because the coastline (the bow) of one tile appears in every multi-tiled object.)
So creating a 4 tiled systems means, that also stars have to be 4-tiled. But you could use a trick to have smaller objects like moons (one-tiled) by overlaying the one ground-tile with another graphic (wood, jungle, marsh etc ..) . But than, there is still the problem, that you can't settle on it without dissapearing overlay
There was a reason, why I used marsh instead of mountains for the stars, but I can't remember why. I guess, it was, because if you settle on marsh, the ground turns into a earth-like planet, as you wrote. In on of the first versions, moons where marsh and mountains stars. But you can't settle on moons because of that, and so I changed marsh and mountains, and disabled the settle-ability on marsh
