I have noticed a few times KDF visitors on Sol vaporizing NPC quest givers near the shipyard ramp. My suggestion to Cryptic, there should be a trigger if a visiting KDF player in Federation territory. When they do anything hostile, they should be flagged as such and a valid target to any player until dead. Respawn would kick the offenders butt back to Qo'nos C.O.D
The same could go for visiting Federation characters should the KDF ever gain the ability to invite fed players over.