This project was for a wheelchair bound soldier with no legs and only one usable hand, and this hand with only his thumb, first and second finger. He requested help to enable him to continue to play on his PS3 play station.
I adapted a new PS3 controller by moving the joysticks to a separate unit and also move two triggers. The right paddle was moved to the top of the tube and the left paddle, reversed, and moved to the bottom. The thumb works the paddle as normal and the other paddle can be used on a table or chair arm.
I created some electronics and mounted them in the new controller
so that when the controller is tilted , the 2 trigger switches change roles from R1 and R2 to L1 and L2 enabling him to use most actions of his games. i.e. in Call of Duty. the top trigger button, with the controller upright, is to shoot the gun but if the controller is tilted 45 deg to the left, the top button then becomes the throw the grenade action.
The joysticks are mounted into a 3D printed split case and glued together with the wires joining those from the tilt board thereby creating an umbilical cord to the main controller.
Unsurprisingly he can play it better than I can, with both my hands…
Rgds
Andy