I'll admit, this AA idea is more for flavor than for actual game mechanics, although maybe some useful mechanic could be added it it.
Title: Make them Surrender
Essentially it would work very similar to Finishing Blow except instead of killing a mob, when the mob's health gets low you would get an emote something like "Due to So-and-so's convincing persuasion, [mob name] has chosen to surrender" At which point the mob would despawn, the group with get equivalent exp, and a chest would spawn with all the loot that was on the mob.
I know not practical at all, but would at times like to play a paladin that doesn't gang-beat every mob they come across.
Thanks for letting me toss out the idea,
Adol Krystin (The Rathe)