SC link hub and steam imput device

Hello guys,

I have a trouble with my SC link. I only have Throttle and Brake and in windows SC hub is recognized as a Controller.

when i open the controller, i can see Z axis press at least at 50% (I have nothing on, my two pedals active X and Y when pressed.

The trouble is that the Z axis press simulate inside some steam game the hold of the Down key.
The only solution I have is to disconnected the USB cable so the SC hub is not a controller anymore.

How can i do it without the hasle to unplug my SC hub ?