GUYS I JUST MADE UP SOME SWEET TALENTS EVERYONE LOOK AT THEM!
Hmm, just brainstorming here again, but for those looking to add damage to the arms tree for pve dps, what about a talent like flurry, but that applies to abilities?
Arms Race 10 rage
30 second cooldown
Reduces the cooldown of your next Mortal Strike and your next Whirlwind by 20/40/60% and the rage cost of your next Heroic Strike by 33/66/100%. This ability can only be used after scoring a critical hit.
With something like this, you could do more often MS and WW, and have a no rage cost (but no rage generated on the strike) HS. It also wouldn't really be overpowered in pvp, since no one's going to stand there for all the gcd's of 2 cycles worth of abilities.
The other idea I had was more of a pvp toy I guess, inspired from the Fire Mage talent fiery payback.