Eh, you could maybe do something like that thunderclap idea as a talent.
The main thing I'd change about Prot Warriors is merge Shield Slam and Revenge or differentiate them better, to me they're practically the same button. Maybe make Revenge deal a lot more damage and give a lot more rage but on a much longer CD. Also I don't like abilities which have both a CD and a proc like SS. Leads to awkward situations like getting a proc seconds before it would've come off CD anyway. Be nice if it was proc only and I got to Devastate more. Might have to adjust rage returns somehow to compensate. In fact, could make Revenge completely CD based and SS completely proc based.