I agree about holding the sidestick with the 3 second pause, but I wanted to find out if it applied to the rudder check.
The reference is to be found at 3.03.10 p2. The Airbus SOPs say:
"Flight Controls - check.
At a convenient stage prior to or during taxi: PF applies full lateral and longitudinal sidestick deflection. This check will be called by the PF as is is carried out......
Note: Full sidestick must be held for sufficient time for full travel to be reached."
This I believe it agreed to be 3 seconds.
However, it then goes on to explain the rudder control check but doesn't mention the above note.