Game Controls Page (0x05) and Multi-axis Controller Page (0x08) are accepted as input devices. Simulation controls, VR controls and sport controls are not considered joysticks and are not reported through the joystick/gamepad API in SDL.
We can change that, but we haven’t had any requests from developers or customers for those types of devices.
Sorry, I mis-typed. Those are usages, not usage pages. The Game Controls Page is not currently supported. The SDL API doesn’t currently map game actions, it just provides raw buttons and axes or a gamepad abstraction.