This could be an extra mode that only admins could use, allowing you to place / remove stars in certain spots for more detailed or accurate constelations.

that is interesting, perhaps like you click and drag a star across the sky?

it would be a bit awkward to save that data nicely, since with how the mod works everything is generated from the seed on the spot each time you load into a world - the only reason stars show up in the same place each time is because it uses the same seed, the mod doesnt "know" where any stars are until theyre generated

id probably do that similarly to how i load planet and star names, where it only loads after the objects have been generated