Artery from Damn Pally Tank found an interesting bug.
Shield of Righteousness Rank 1 and Rank 2 have separate cooldowns.
This is an interesting bug, not only does it help tankadins generate more threat but also allows you to produce more damage. When I tested this on a test dummy (lvl 80) I was able to hit around 2-1.5K Rank 2 and 1.5-1K with Rank 1. Keep in mind I am currently spec retribution. I can see someone spec as a tankadin hitting much harder, especially putting points into Shield of the Templar.
Like all bugs blizzard squishes them. I would not expect this bug to be around the start of the arena season.
Warning: Abusing bugs/exploits are a bannable offense. So proceed with caution.