I was going to stay out of this, but with ID turning half of our DPS Mages into Chloros the Clerics being low on the meter is starting to get old. I agree that Cleric DPS is amazing, for some specs. Druid and JnB parse very well on fights that are melee friendly. We know that just isn't the case for Fire wing.
I would love to see a 51 Inquisitor build shine once again. Maybe a passive talent higher in the soul that allows Sanction to refresh the duration of Vex could help?
Im betting a few more GCDs per minute would net some good results, especially if the refreshing applied the initial damage of Vex as if it were a fresh cast (much like how Blazing Strike reapplies Fiery Spike for Rogues) Of course for this to be viable either the duration of Vex would need a slight increase, or the cooldown/duration of Sanction would need a slight decrease.
Another option that could either tie in with my previous thought or be separate for a few GCD gains would be making the HK Crystal proc'd Sanctions cast off the GCD.
Sorry to infiltrate the cleric boards, but I actually do raid HK with mine. Haven't seen any ID on her yet but since 1.8 hit it's been obvious that a Cleric doesn't have competitive ranged DPS anymore.