Throwing my hat in the ring... Stardock has introduced tons of great additions for Dark Avatar (without upping the price? Are they MAD?), and lots of people have suggested what they'd like to see. I gotta say, I like the idea for nebulae that someone had. Space terrain that would lower sensor range (hidden ships!) and possibly speed as well. The asteroids will be an interesting barrier on the map, but I think pretty blue or pink clouds of dust that could hide an invasion fleet would be super fun!