Both P-47 and P38L have "dive recovery flaps" in real life.
In the game, there is a dive recovery flaps yellow light which allows you "dive a little faster"..... turn it on when you take the runway as it has zero drag, zero effect except for allowing you to go just a little faster.
In Real life, it was a hydraulic flap which actuated into the slipstream moving the center of lift to regain aircraft control (while also slowing the aircraft some). Better explained here:
"The P-38's dive problem was revealed to be the center of pressure moving back toward the tail when in high-speed airflow. The solution was to change the geometry of the wing's lower surface when diving in order to keep lift within bounds of the top of the wing. In February 1943, quick-acting dive flaps were tried and proven by Lockheed test pilots. The dive flaps were installed outboard of the engine nacelles, and in action they extended downward 35° in 1.5 seconds. The flaps did not act as a speed brake; they affected the pressure distribution in a way that retained the wing's lift."
-Bodie, Warren M. The Lockheed P-38 Lightning: The Definitive Story of Lockheed's P-38 Fighter. Hayesville, North Carolina: Widewing Publications, 2001, 1991. ISBN 0-9629359-5-6.
They worked so well, they were equipped on the mighty Jug as well....
P-47
So just like the maneuvering flap setting which really doesn't do anything for the aircraft, the dive recovery flaps are also "just there" in the game...
From the report "SUPPLEMENTARY REPORT ON TACTICAL SUITABILITY OF THE P-38G TYPE AIRPLANE AS COMPARED TO THE P-38F 3 May 1943
One of the conclusions was "
c. The P-38G turns much better than the P-38F (will close 180° in 360° circle) due to maneuver flaps."