>LOMCEVAK Va is the maximum speed at which full control (rudder, aileron/spoiler or elevator/tailplane) may be applied without exceeding the structural limits
It is interesting that you included rudder. In fact, I believe the definition of maneuvering speed in many books ought to be less simplistic. However, for the moment, consider that aerodynamic equations assocoated with maneuvering deal primarily with lift (G's) and airspeed. It might be found that today many pilots have re-thought how rudder use fits into these equations.