Unrealistic? You swap the folders and files and its "realistic". If you can make a starbase into a moon and vice-versa, it is pretty much only limited in potential by what it is you want as an object and what you want it to do.
I have no particle forge skills--though I can give it a long, mean stare when I am motivated--but many others do and find it pretty easy to work with. Adding a simple particle effect isn't that difficult for a person that knows how to go about it.
Now rotating and talking Max Headroom heads in space or a floating Kryptonian council...that would be hard.
A starbase can be a moon, or a defense center, an area ability buff generator--lots of things it can be. It could be a giant Vasari statue in space that shoots lasers from its eyes or a pair of rotating space ponies. Pretty much up to the modder and his or her skills. You could pretty easily have a planet and a wormhole animation together as an example. I'm imagining it's not that difficult. A planet can be replaced by a giant ship with planetary capabilities, etc.
I think it was Celestial Bodies now that I am thinking about it that came with the "add these" instructions. Was very nice.
I've looked in 7DS, DS and Maelstrom and it's really amazing all the "impossible" things they pulled off. Lots of untapped potential.