Surely not the whole world? Can't you clip it out with a frustrum? Could you not just render a bland generic terrain texture if the plane is pointing upwards (same with the sky pointing downwards) and ignore anything beyond 1000 yards? I'm just doodling, I'm sure it's not a superficial change if it wasn't incorporated from the start. Thanks for the answer anyway.
You couldn't tell me which API you use for Force Feedback could you?