Most WWII era aircraft did not have a dedicated "reverse thrust" range on their condition (prop) levers.
As for using reverse thrust, no aircraft uses reverse thrust in flight...it is a definate no-no...it makes your airplane fall out of the sky! Reverse thrust is only used during the landing sequence to slow the aircraft enough to be able to apply the brakes without overheating them. Brakes are normally applied after the aircraft has slowed below 78-80 knots. To assist in transferring the weight of the aircraft to the wheels, so reverse thrust and brakes can be more efficient, some aircraft deploy their spoilers to the "ground limit" to cancel all lift. On some aircraft the reverse range of the props (C-130, Dash

or the reverse thrust of the engines (C-17, C-141) is so strong that the aircraft can actually back up and maneuver while doing so!
I hope this helps some of the simmers out there with little real world aircraft experience.
L.A. Smith
pilot (recips), A&P mechanic (recips, turboprops, jets)