What would be more interesting is if we got, for example, Ahoo'ru's Ring of Orbs from the Brawler's Guild that slowly draws closer to the target. It would function similarly but when the orbs reached their center point, if the target is still in it, they take a stacking DoT or HoT (Dependant on spec) for each orb that hasn't been run into.
Also, you could alternatively have a talent; Avenging Angel that reduces the damage and healing bonus of Avenging Wrath to 5 or 10% but makes it permanent, and then gives you an additional spell. Obviously, spell names are subject to change and such, but the additional spell would unleash the Avenging Wrath into an Angelic Form, briefly changing your appearance and increasing the bonus damage or healing, (based on spec) to 40% for 15 seconds with a 5 minute cooldown. While the ability is on cooldown, however, you do not receive the constant benefit of the talent.