Is there a way to get the Star Solver to autogenerate an asteroid belt in an system imported via a planets.sc file? I have thousands of pre-generated systems I want to import, some of which have asteroid belts that are just defined by their presence and width, and so far it looks like I'd have to make every asteroid individually (which isn't going to happen). 

I know there are some procedurally generated systems that seem to have asteroid belts in them so is there a way to tell the Star Solver to create a belt in an imported system if some parameters are defined?

Here you can find the Python version of my Asteroid Belt Creator.
This version should work with Python 2.x and 3.x.

(There was also a Gui version written in C ++, but the links in the old forum no longer work.)

Here is the direct link: AsBeCre-v0.3.1.py.zip

Thanks - I'll take a look at that but I'm not sure it's going to be very practical - I have 250,000 systems to import and I'm not sure if I'd be able to generate an entire belt for each system that has one like that (if I could call it somehow from my program it might work though but I'd have to figure that out). I was hoping there'd just be an automated way to do it in the star solver but I guess not? 

Also is there any way to get the star solver to generate moons for imported planets? It looks like they all get imported without moons by default.

I also have a 'MoonMaker.py'.
(It only works with Python 3.x.)
But it is even more difficult to use. You have to enter the parameters of the planet by hand.

Also is there any way to get the star solver to generate moons for imported planets?.

I've played around with getting the star solver to do things before, and as far as I know, it's not possible. The SE star solver only seems to generate things if there is NO information provided. If you use a .sc to give a star just one planet, it will not generate any additional information for the whole system. Sometimes it won't even fill in the gaps for objects you do give it. 

Unless there is some internal way to call it to perform specific tasks. If that does exist, I imagine only SpaceEngineer knows about it. 

On a side note, where did you get 250,000 systems from?

I generated the systems myself, I have my own proc-gen system I used for a scifi setting I was working on.