If you ever wanted to get rid off all those FQM massive asteroid systems, well do what the Expanded Mod AI player just did to me. I had nearly turned most of those asteroids, some 50 or more total, into planets when a lone AI ship entered the system and proceeded to the start. OMG! Kabooom, the who system was layed waste as the AI colapsed the sun into a black hole. No more asteroids.
Well this got me thinking, who needs a system filled with 50 planets or more? I know that colapsing a star in many of the problem systems, such as organic infestation, comet systems, etc into a black hole then killing the black hole opens the system back up. It never occured to me, that is until the AI did it too me, to use this method to clear huge asteroid systems. Once they are all gone, I can create a new star and build a sphere world.