In my company JAR operator and in fact in every sim i have every been in all boeing, all performing boeing sop's you would without question fail your RTO section of the sim if you didn't manually move to, or if your quick extend the speed brakes.
That from my point of view is the legal part for you black and white.
Talk it through and keep it calm:
STOP,
DISCONNECT AND RETARD,
SPEED BRAKE DEPLOY, (At this point the a/c will pitch nose down as the brakes kick in.)
CHECK RTO BRAKING MANUAL IF IT DOESN'T WORK, HEELS ON THE FLOOR IF IT DOES,
REVERS THRUST AS NESS.