CS:
I very much doubt that AOPA would support such a list as there seems to be some sympathy towards PPL Instructors in that organisation.
IF it was ever approved, PPL Instructors would increase competition for Instructing Jobs and therefore lower the pay rates as they will have to work for free.
I think a Pilot's organisation would be better politically to publish such a list (I don't know how they would legally do it though).
Does anyone know of such a list being published in other Industries outside of Aviation?.