This is something I found out today while me and a friend were clearing ZG for fun.
My specc at the moment is retribution. (Doubt specc matters tho)
Once we cleared the place and got to hakkar, I realized after using Lay On Hands, that every time I hit hakkar, it refreshed the cooldown.
Just to be sure I tried it multiple times and each time I hit hakkar it refreshed the cooldown.
paladin > hakkar.
Was gonna post a screenshot, but didnt get any good shot at the combat log where I used it multiple times at the same page, so you'll just have to try for yourself to confirm.
Have fun paladins!
Edit. 05-21-09 at 06.50 AM.
Here's screenshots from todays attempt, and it still worked for me. Didnt work at the start of the fight, might've been the first drain that activated it.(Not sure thought)
Talent build