If by "sj's planetoid", you are referring to the BattleMoons in my mod;
You can't really add and remove moons and planets at will, and the BattleMoon is just a big, slow ship. So, no, not really.
I just described it as taking an asteroid and hollowing it out, thus there are thousands of potential sources for the BattleMoons, and you don't have to worry about running out.
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And also can you add planet specific events I.E a atmosphereic planet accident or a biogentic plant mjshap ya'know a gient bunny destorying the colony thats sort of thing.
I don't think you could destroy the colony unless you had the planet itself blow up... but you could have the event kill off a trillion people per event, leaving the colony empty and useless untill a transport arrives with more population.
Good luck with your mod, and if you have any questions about how I did things, just ask
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