We do all our flightcontrols checks PRIOR taxi (A319/A320/A321/A330). It has been mentioned several times, that the feedback of the travel direction is taken from the sidestick and not from the aileron itself. I don't agree, because if all the hydraulics are depressurized (engines not running), the aileron droop is visible on the FCTL ECAM page. With a centered stick, there would be no directional feedback.