Nomad factions should be the only faction that can kill on the spot with no RP lines. If you see a K'hara, you should know exactly what to expect. Fear or adrenaline should be your response. The only limitation to this is players unable to use this power responsibly. Snowball's chance in hell if that ever happened.
Awhile ago my smuggler was killed 10K from Crete. I gave props to the player and, at first they thought I was being sarcastic, but I was being serious.. There is no room for diplomacy with the nomads. Dealing or bartering with nomads would go against the RP. Except for Hank Rover. He makes friends in all the strangest places.
It ain't about what you are capable of, it's about what you're willing to do.