Hello I play on mostly 1.12.2, My main pc controller is a sanwa 16 button gamepad. Is it possible for you to make it compatible? Your mod reads it fine but it partially confirms all the buttons.

Controllable doesn't actually make controllers compatible. Support is determined by GLFW, the underlying graphics/input library that Minecraft uses. You'll have to fork this mod and use an alternate library if you want to support a niche controller.