Reminds me a bit of Cosmic Encounter, how you needed to get 5 colonies in your opponents' home systems to win...
/me wonders if the victory conditions in SE5 can be modded to say you need to control specific planets other than homeworlds... that would be interesting
It would also be fun to make a mod based off of Cosmic Encounter... the problem is, how do you give the feel of Cosmic in SE4/SE5? All I can think of is:
1. Lots of unique, bizarre racial traits, much like Stars!
2. Mod treaties so that they are geared toward short-term temporary alliances with lots of backstabbing, instead of long-term alliances.