Well that's a pretty cool way to implement them. What exactly do the moons do though? As of now I would think being captureable is the way to go (it would take a lot of firepower to blow up the moon completely), but that would depend somewhat on what their function is.
As a tactical structure, they can have anything currently associated with a tactical or logistic type structure. It does add some flavor to the scenery as well as add an obstacle to move around.
I originally hoped they could be spawned as starbases but the galaxy scenario def doesn't allow that entity type which I wasn't too surprised after perusing the Distant Stars GSD, but wanted to try to make sure. I'm thinking it would be a natural place to house strikecraft or other interesting abilities. Could be a new set of research on the Defense tree. Still working through some ideas but thought it might make a cool addition.
It would also be possible to have race specific moons on home planets that only get abilities/improvements for that race and specialized/generic moons on neutral planets. The neutral moons could be randomized in the galaxy scenario def by using the WithChance types.
I also appreciate tangents a lot more now....
How the... Does that thing give/take up tactical slots/structures or something? Maybe make it "destroyable" like planets?
It's currently setup like a structure so you can attack it but not bomb it. Only planets can be bombed. They could definitely be destroyed though which might be kind of interesting. I'm still on the fence with this one. I'd think they would have to have some insane health though if they were destroyable.