Glory and I worked on some macros for helping out a tank with some abilities to take advantage of new talents and increase threat generation.
One of my macros is an AoE macro:
/cast Thunder Clap
/cast Cleave
I just spam this around multiple mobs while tanking and it will either Tclap or Cleave, depending which is on cooldown. I don't really care which one takes place as I would just spam it in any case. =)
Another macro is one that takes advantage of the fact that Heroic Stike and Rend do not share the same cooldown.
/cast Heroic Strike
/cast Rend
The reason to put Rend into my rotation is for the Blood and Thunder prot talent that will spread Rend to other targets the Tclap hits.
EDIT: I just ran HoR with this setup and maintaining threat on multiple mobs much easier and the run went very smoothly. I was impressed. =)