as far as I understand the articles it is not possible to excempt USB-Devices within EEFF via DeviceID - this is something for Data Loss Prevention. The article KB71266 is just a workaroung for USB-Floppy Devices which don't go along the "Make Floppy Disk Drives Read Only" policy and need an extra traiting to work as wanted.
Currently in EEFF the Device exempt will work by adding the "Device Instance Path".
A new PER needs to be created for adding the request feature.
Naveen S Yeshodara