The rudder will move in response to rudder pedal movement, but the device which limits the travel at high speeds will be using the wrong speed as a reference - so you may get too much movement.
OVERTALK
You got there just before I did as I was ploughing through the pages - I was going to ask if anyone knows what the roll limits are for the IR's and ISIS, whether they have full freedom or cannot survive a 360 degree roll. Because, as BOAC alluded to earlier, how does icing make an IR fail?