If your adm file imported without errors and you're in your RESTRICT DRIVES folder of the GPO Editor and you are getting the message "There are no items to show in this view" then you need to turn off all filtering from the VIEW drop-down menu. Then just go back into the RESTRICT DRIVES folder and your settings will be there. You will still need to go into each one and enable it.
This is how far I've gotten, I've tested it and it works but I can still transfer files to/from floppy, copy from cd-rom, open off of media even though each of the numerics have been changed to 4 in the registry (which is the default value for disable from what I can tell). Any ideas?