Btw, has anyone noticed that you can use diplomacy with minor factions?
Just start diplomacy with one of the majors, and then use left or right button at top, to scroll to other leaders, influcing minor factions.
You can them make tech/trade treatises, or sell them excess resources (since they usually have some excess gold).
I noticed and that's part of why I made this post. As a Empire faction you have a small dilemma. Kill the faction to get access to powerhouse troops, or keep them as a source of monetary gain. As a Kingdom Faction, there is no Dilemma, Why would I EVER kill a minor faction. They have no strategic resource I'd ever want, other than money from Material trading and treaties. At least in GalCiv2 the minors all had awesome planets that you probably want regardless of strategic resources or moral leanings.
The second reason I posted this is I read a post somewhere (Think from Frogboy) saying that the minors had rare resources that you'll want like crystals and shards. My Kingdom faction would love to get those... but Ogres are useless.