For talents the 5 pnts in cruelty will help , more crit chance equals more chance at a shield slam crit. I used to be agains using anything in the fury tree as a prot tank, but ive notice a huge rise in my shield slam crits and that equals nice aggro. Also having 2 pnts in IMP demo shout is great for raid bosses, and by the way 2 pnts is the max effective against raid bosses.
I have 9.38 ish % to crit and 440 SBV wich is getting me a average of 600 Shield slams and with on the high end a little over 2k crits.
There is something so appealing about backhanding someone across the face with a shield.