Most 2x6 games actually don't need their specific IO boards, simply a JVS IO that can satisfy the specific needs.
In the case of RRV for example, the game will turn the steering wheel all the way one way and then the other to test the steering potentiomenter using the FFB motor.
It also recenters the wheel when returning to the main menu, as selection of game modes is done by the steering wheel.
If the motor doesnt move the wheel at the expected time, it'll fail the tests. I don't have any sega ffb setups, but I suspect the IO's with output could be made to control a ffb motor, especially as the game works fine in every other way on any analog capable IO that's been tested.
These patches simply patch around the ffb test and recentering, and will cause the game to simply assume the wheel is centered as soon as the user inserts their coins.