Currently there is no capability to use a USB key to configure a system in SMB mode. You could probably customize the Intel SCS (downloadable from the Manageability Developers Community web site), to do this...
The USB key does not configure the AMT portion of the PC. It only loads some initial values to identify itself to the SCS that then configures the PC remotely. The USB key can not be customized, and the USB key can only be used to load these initial values.