Quick update, USB unlock can be from any number of drive letters. locker.exe and locker.ini changed. If you choose to use the usb unlock...
Put a file on a usb stick with your code in that file
In locker ini, add that drive letter and the name of the file
When that usb stick is inserted, the lock screen is bypassed. With the latest update, if the screen is already locked, it will unlock the screen if the usb stick with the correct code is inserted.