There seem to be two inter-related but separate subjects here:
- Should the rudder ever be used to max deflection?
Answer - If neccessary (but this presumes a unidirectional input).
- Should the rudder ever be cycled?
Bearing in mind the gear locking procedure quoted above, the answer must be - One side at a time and then wait in neutral - a continuous cyclic movement can well lead to the separation concerned. (And by the way, a "coordinated turn" won't help the gear locking - because the ball will be in the middle).
We all need to learn more about the use of the rudder - it's a friend if treated right and a fiend if not.