lol, dyson spheres have been talked about, but they were discarded.
I DO think that the hotter the star, the more distant ships must stay away from it. Also, as for the idea of antimatter harvesting ships, i think there would be problems with camping and micromanagement.
Stars randomly giving off bonuses is a very unrealistic idea in my opinion, they should do more than they do now, but randomly giving off random bonuses is pretty rediculous. I think that as galaxy formations currently are, stars shouldnt even be included. 30 habitable planets in a single solar system is very improbable, even assuming that every desert, ice, volcanic, and terran planet is habitable, 30 is still very large. I believe, (and this has been suggested somewhere else as well) that stars should be removed, and planets should just be treated as the habitable planets in the galaxy. This would explain why only a few planets can be seen for every planet you colonize, your sensor systems can only reach so far in detecting habitable planets.
A scale system like the one employed in Galciv would be nice, maybe not as blatant as 'class one, class two, etc' but something to show a difference between planets would be nice.
more ideas, but it's time to go home