So I'm looking at the button, and I think to myself "They could do so much with that option alone...."
Sure we have Clusters(loose and tight), and just randomly scattered. But why not galaxies in different actual paterns? We could have various styles of 'arm' galaxies. We could have a galaxie in a shape of an 'o' with nothing in the center, or all the stars crowded right in the middle. Or tightly packed stars in the center of the map which disperse outwards towards the edges.