Well with the new dungeons in mind and the fact we won't outgear it from the start, I've more or less decided that having a tank class on more than one account might be a good idea. I have a 4x dk + disc priest as team B, which I intended to run only in pvp, but off speccing 1 dk as tank won't be a huge deal, he can help out my standard pally 4x shaman pve team if needed. That being said, I took a closer look at enhancement plans for cata and what I was wondering:

unleash elements sounds like a taunt to me and rockbiter weapon gives a 30% threat boost + 5% damage reduction (combinded with frost shock, thats quite some threat generation). Would it be a viable option to spec 1 shaman ele/enhance for certain encounters so that the enhance can taunt off a mob for a few hits? Like has anyone tried such thing on beta?