well you forgot Hellhound who voted against unit experience and for Commander EXP....
Anyway if it gets implemented, my trait:
Weylandish Raider: Raids are conducted succesfully on a +3 instead of a +4. Additionally to the Gold Roll another Roll is conducted on Slaves captured during the raid. -1 in Defensive Battles (can be removed with the Defender Trait)
Description: Weylanders have become known for their raiding and ambushing Tactics during the last century and their bustling slave trade has become famous. To naughty children it is often told that if they don't behave, the Blôdvindrs will come and snatch them in the night, a tale which is actually true. They have become very experienced at Raiding and often people don't even have the chance to react before they are gone again, with all their bleongings and half their family...
if that is too overpowered
Fearsome Reputation: Enemy units need to do moral rolls if they clash with your troops. Your troops will fight to the death in any situation. -1 on Tactic Rolls ( can be removed by specialized Traits)
Description: Corvinus McRiars Svartblôds have not only become famous for them consisting only of bastards,oathbreakers and kinslayers but also for the sheer cruelty with which they do their job. Especially Corvinus is known for his outright brutality and his easily raisable temper which lead his troops to fear him more than even death. His outright ignorance in terms of prisoner treatment and the sheer despair with which his troops plunge into death let enemies think twice before they meet the Weylandish Mercenaries.