Peer review
You don't even want to go there. "Peer Reviews", at least in industry, means a personality contest. We really don't need that, and in fact, have no room for that, in this business. Whereas I would like all my fellow crewmembers to work and play well with others, dress appropriately, be clean shaven, not smell bad, etc, I'd much prefer to fly with guys who know how to fly the jet and more importantly make good decisions during bad times.
I don't see anything other than a seniority based system in the vast majority of the airline industry, at least until all airlines are being piloted by computers, or guys sitting in Operations building somewhere.