I'm not so sure about permanent H/P gains, but maybe a kind of 'unique item' that nobles can farm for? "Pelt of the White Boar" or "Golden Stag Antlers" and all that. You can have a Honor or Prestige boost that isn't overpowered, might even integrate into the advy game of barter, and gives people the all-too desired 'achievement/medal/whatever'.
Additional thought: It would be kind of neat if you could 'organize a hunt' like a tournament announcement. Some region owner pays gold depending on how many takers you think there would be, folks join, whoever gets 'the kill' ends up with an item. More prestige for bigger hunts, chance of complete failure, a convenient message group for folks to RP, etc.
My main problem with the feature request is that it doesn't create character interaction. We need more features that bring people together, not stat-grinds that keep people from talking.
