This mod is really cool and I've been looking for something like this for a while. However, if you can, I'd personally like to see if you could somehow add something similar to a quasar. (E.g. give the black hole an accretion disk or relativistic jets or something like that)

Something like if the black hole eats enough stuff, it shoots out jets/beams from it's top and bottom or gets a disk of particles that orbit it.

I think this would be a nice addition to see but I don't really know if it's possible or not. (I don't know how to code mods for GMod.)