Correct me if Im wrong, but not all WEP settings were mere full throttle, manifold pressure and RPM settings. It vaired from plane to plane. There were in many instances where various types of supporting injection systems activated that were reserved just for WEP settings that provided additional boost, cooling, or both. IIRC some systems had a wire stop in the throttle that you had to break which activated the supporting system, while in other systems you had to flip switches. Considering that, WEP should have a seperate control.