I like these ideas. For me, I would like to see Aura Mastery on a shorter CD, seeing how Shamans have a 1 minute Aura Mastery, I would like anywhere between 1-2 minute CD on our Aura Mastery and have it break silences, because it sucks when you Aura just a fraction of a second too late and you're blanketed...Also, I would like something done with Hand of Sacrifice, maybe on a shorter CD, 1 minute to 1 minute 30 seconds? Because it just get's spell stolen or dispelled off most of the time anyway. I rarely use Divine Plea, but maybe just remove the 50% Healing Reduction penalty from that. Besides that, I like the ideas you've come up with.
Shaman aura mastery is a 2 minute CD, dispellable, and our 4 piece PVP resto set-bonus, plus you can pop yours in a solar beam! Wouldnt really compare them.
Thinking Sacrifice on shorter cooldown shorter duration would be a nice skill change. Probably something done in the Clemency tier since nobody ever considers anything else.