One of the things that seem to be impossible right now is to specify texture and terrain for planets in the map xml's. Is it possible to include this option in the future? Right now all you can do is specify location and class, but not how the planet will look.
Also why is the size of stars capped while planets are not? I can make HUGE planets that take up many parsecs and dwarf it's parent star yet I can't make a star larger than one parsec. Just thought it would be interesting to make star systems that are slightly more to scale.