Off topic is across all forums... But judging from your post, you are talking about SoaSE in particular since GalCiv2 already has this option. I would not be to suprised if this feature does appear in Sins, since the next mini x-pac after Entrenchment will be about diplomacy and the peaceful side of the game.

I'd recommend putting it in the Sins forum if it's about Sins...

Anyway to address the issue, I see your point but I think it would probably only work right if there was some sort of slowed-down empire-building mode.  Since Sins is real-time, planet ownership tends to change somewhat quickly and I think something like this, while cool, would just add yet another layer of micromanagement to founding/retaking planets.

governments are surely a good idea, but I agree that this is definatley something for the empire wide level and not on a per planet basis. makes less sense and creates more micro. in about all 4X games, government type choices affect all cities/ planets/ colonies in your empire.