A new game mechanic
I'm not sure if this has been mentioned before or if it was tried in diplomacy beta, but how about a way to become 'allies' with neutral planets?
It feels kinda wrong to go to these planets, wipe out the militia, and take the planet. This could be a way get more use out of the diplomacy mechanics. obviously, there are some balance issues to work out, but at the very least being able to bypass a planet's militia or beef it up early could add some new strategies to the game.
I also (in a completely unrelated idea) think that now that there is a way to win via diplomacy, there should maybe be a way to win with culture. And now that I think about it, shouldnt culture have an impact on diplomacy?
I dont know, maybe its late and I'm non-sense-making again.