If it were up to me, there would be no bounty quests, and instead you'd just get much higher rewards for killing people.
But otherwise, can't they at least just let you accumulate kills, and not require a turn in every 20?
In keep defense, I'll get 20 kills in like 1 minute! So either I can actually help my group defend the keep, or I can be a feeder, and keep teleporting back and forth, turning in quests. The current system encourages you to constantly ditch your group to go turn in!
Not only that, but it's just adding yet another PvE element to getting a PvP based reward, which I could do without...