In the book Never Call me a Hero, the author mentions that there were controls in the rear seat of the Douglas SBD Dauntless. However, I don't recall ever hearing this before, though I know the TBD had controls in the second seat. Did the SBD have controls in the rear seat?
The Dauntless did have controls for the rear gunner- a pair of permanently attached rudder pedals and a control stick that was stowed away on the port side until needed. See:
Juan Jimenez is correct that it would be very difficult to operate, what with the armour plate for the pilot and the radios right in front of the gunner. See here for a story of flying a veteran Dauntless where the pilot gets a brief familiarisation flight from the gunner's seat (it's mentioned in the fourth paragraph after "SBD Glider: Engine Out"):
You can see the gunner's control view at the Smithsonian's walk-around view of the Dauntless, it's images four and seven in the collection (six shows the pilot's view and eight the gunner's real place of business):
The concept of the rear controls (stick and rudder pedals) was two fold in that 1: the gunner/radio operator could recover the aircraft in a nose up climb attitude if/when the pilot blacked out from excessive G during a dive an 2: the aircraft could be recovered to straight and level should the pilot be incapacitated allowing the rear seater to bail out. The rear controls were never intended to land this aircraft. Interestingly the Germans incorporated an auto recovery capability into their Stukas in the early 1930s, this technology was never adopted by US manufacturers