The HORI RAP4 is a fight stick controller is a heavy solidly built USB controller that can be read by the USB-A port on the Quadstick. Unfortunately it cannot be used for authentication for the PS4 console.
Its joystick and buttons follow the same mapping to Quadstick "usb_*" inputs as the DS4. There is only one joystick and it is not analog. The value it produces is either 0% or 100%.
USB Host DS4 tester is an example configuration spreadsheet that can be used to base a custom configuration on.
More information can be found on the HORI website.
