gameport is separate from USB. It's like saying "You cant mix PS2 and USB!" -- which isn't true. You can have something on each plug, and each will act as it should (that is, each will act separately, but correctly).
P.S. If you had rudder pedals and you TRASHED them, you don't deserve any more! Ever again!! (instead, as punishment, you must buy me some pedals and watch as I cherish them for all eternity).