I've been using it that way since WOTLK came out and I don't have it macrod to anything. it's just the spell dragged from my spellbook.
I click a mob that isn't attacking me and click righteous defense and it taunts up to 3 guys onto me.
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i use both Hand of Reckoning and Righteous Defense in the same "taunt" macro.
i just use [@targettarget] for righteous defense so i can use it the same way as Hand of Reckoning
I have them on separate buttons, but had a macro set up so Righteous Defense could be used as a regular taunt when targeting enemy, and its tooltip function when targeting friendly.
But if it does this by default now I can take the macro off, have not had a chance to test it yet (did not want to risk it while farming icc trash last night.)