Vampirism better questing integration:
Task for sucking blood
Task for required vampire or hunter level respectively (reaching specified vampire level = task completion)
Task for infecting npc with vampirism
Task for killing vampire with stake

A better questing addon would serve as a nice bridge between other mods. Compatskills for example. I could require a player level up a blood magic skill with the early progression being sucking blood variable amounts of times.