Ok, I know a long time has passed since I posted about this, but I finally got my final setup and ended up reverting the firmware that does not recognize the buttons. While I was doing this I noticed something that might get you an idea if you can solve with some sort of firmware or software upgrade. I noticed this while playing RACE 07, which displays the controllers that are connected to it. I am sure that this is also probably the cause on rFactor.
The sim only recognizes up to four controllers. The keyboard is always registered as one of the controllers. The steering wheel is another controller. The CSR Elite (or CSP) also register as another controller. Now here come the problem. The ProShift displays as a controller, even with the firmware that does not activate the buttons. The real problem comes when I flash the firmware that enables the buttons. For some reason the game registers as if two Pro Shift were connected. As it appears with the explanation before it basically looks like this:
Keyboard
Steering Wheel
Pro Shift
Pro Shift
(Clubsport Pedals do no appear under this configuration)
Without the firmware it looks like this:
Keyboard
Steering Wheel
Pro Shift
Clubsport Pedals
I hope this could give you an idea of what is happening and if there could be a possible solution.