Manhunters, yes, please! Bandit faucet is also a great idea, could be bound to the bandit caves, but I can't be assed to not "send troops" on that one and waste my time for these. Also one should be able to send Manhunters aloose in service to gain gold & renown!
Looters generally scale badly, too. Their troop tree is non existent, so in the late game, even 200 looters don't scare you and other lords, they are just annoying really. Looter parties that survive a year should be given a badass name and some better troops so they are worthy to be hunted and give you a better renown and some rare loot.
Since they make up half of the early game, and really no difference in late game, other than being annoying, they need some more twists.