Raas 767 put it in a nutshell. On the one hand, I've never seen warnings about sudden full rudder deflection at high speeds anywhere, other than the fact that any pilots knows that even partial rudder would frighten the passengers and might hurt pax or crew (and spill very hot coffee).
Our Aircraft Operating Manual clearly describes rudder restriction mechanisms with increased restriction from 170-300 kts, and a different restrictor to reduce unwanted side slip characteristics, engaged with slats/flaps 0 or 5 (on the dash 30 and 40 series Douglas).
[ 14 February 2002: Message edited by: Ignition Override ]</p>