Cravers should not lose approval when refusing a peace treaty

Cravers should not lose approval when refusing a peace treaty. In my current play-through as the Cravers, I'm a few turns away from destroying the Vodyani but all my systems are in chaos and the FIDSI are suffering. Why? The Cravers like being at war. The only way I can keep my systems in order without using my few luxuries is to suppress them which uses manpower. To keep my manpower up I have to activating chain-gang (or whatever it's called that turns a pop into 300 manpower). I'd be ok with the activating chain-gain to suppress rebellions but it's really taking a toll on my ability to stay competitive.

UPDATE: It appears you get this ability in the Cravers quest-line in the final release.