Sectors, would mean they have to add more sectors though ideally. Or make a "dark half" and a "light half", there certainly is room for more star cluster sectors though, some of them abut two grids when they are only 1x1, could make those ones 2x1 and have one half be more aggro oriented than the others.
no. just make the game harder. I don't want to have to make it harder myself by hitting a slider. unless it gives me significantly better loot than the easier mode. but then everyone would just do it anyway, so whats the point in adding it