Peter Dohm wrote:

I have been told several times that ... the maximum speed
permissible for full rudder deflection is frequently less than the stated
"maneuvering speed.

You have been told rubbish. Up to maneuvring speed it is safe to
instantly and fully deflect any ****rol, also the rudder. *But* this is
only true from straight and level flight and for one isolated deflection
of one isolated control. (Which the pilots of that famous Airbus
obviously ignored, who wildly waggled the rudder until it broke off,
creating such urban legends like the one you've cited above.)