AS - serious question. What stage of '737 training' are you at after the L200 time? Depending on your answer, I may need to place your airline on my personal 'nofly' list.
A/T disengages 2 secs after touchdown following RETARD. If it had not retarded, you would be emulating that AB that killed everyone by flying off the end somewhere at 90+kts with power on. (Yet another breakdown in BASIC FLYING SKILLS!!)
I do NOT know if it will:-
a) Try to maintain target speed
b) then disconnect 2 secs after touchdown if it does not RETARD, and I am also NOT interested since I would be FLYING the damn thing and it will not happen on my watch.