Is it possible to put in a button on the floor that we guys with autos could use to hit shift in two neutral shift from 4Hi to 2wd and then let the switch go and drop back in to gear???

the reason I am asking this is I saw someone else with a manual hit the clutch switch from 4hi to 2wd and he was running 14.5 on the 1/4 mile. is this possible or is there no reason to launch in 4hi then swap to 2wd