Hi v.h94,
Unless you have something outside of SS08 to make them appear as one joystick then I think you are out of luck.
The control setup in SS08 means that you can set any control on your joystick to a function in SS08, but, there is only the one set of user settings. There is a possibility that I'm wrong about this and I'm sure that someone will tell me different if that is the case.
Regards, Dave