I have a system that utilizes both gpus and fpgas and I want to run one cgminer instance for gpus and another for fpgas.  Starting in 2.11.0 with the new usb subsystem, I am unable to start an instance of cgminer for just the gpus.  Whenever I try to start the instance for gpus only, cgminer displays "MTX: BitForce USB failed to get cgminer-usb..." and exits.  Is there any way to disable the usb detection like how "-S noauto" used to work?