flying level on S.E. approaching the glide from below..I am intrested in controlablity.that is, with every config change, there is a corresponding thrust change which leads to change in rudder input.the largest change in speed (read thrust) is from S to Fspeed.~50to60 knots.I would select flap 2 just as g/s comes alive.power would spool back to idle.hardly any rudder required. can select flap 3 at 1 dot.At g/s* L/g down (by this time you are also pitching down power change is quite easily managable) and in quick sucession flap full. as the power increases apply rudder ....
SOP,FCOM,FCTM,..ETC are books to help us acheive a safe flight condition....CONTROLABILITY (remember FLY,...,...).as long as we dont miss the woods for the trees we can all find our way to the local pub after the flight..cheers