[PERTAINS TO MICROSOFT OPERATING SYSTEMS]

The solution is easy enough, at least to me:

Simply add my registry fix (as noted in previous linked thread) for "DISALLOW COPYING" to the USB device (machine level) to the logoff script of administrator accounts and the "ALLOW COPY TO" to the logon script of adminstrators from either local policy (for workgroups) or push it to each machine in a group policy.

Here's the amazingly simple way it works:

1) User is logged on and cannot copy ANYTHING to the USB port because of the standard "DISALLOW COPYING" registry entry. Now along comes the administrator.

2) Administrator logs on locally using "Switch user" or logs in from the welcome screen, as normal. (I have not tested "RunAs")

3) Upon logging in, the logon script in the Administrator "USER" local policy section automatically enables the ALLOW USB COPYING".

4) The administrator performs file transfers to and from the USB device, then logs off.

5) Upon logging off, the logoff script in the Administrator "USER" section automatically returns the registry entry to it's previous "DISALLOW COPYING" value.

PROS:
Any registry changes are immediately effective and don't require a reboot or refresh.
No difficult registry hacking or programming needed. A simple .cmd or .bat file.
Cannot be changed by anyone except an administrator level account.
It's machine level effective, so no worrying about how it effects new users.
Set up and forget it, it works every time.
Extremely easy and time effective to add the logon and logoff file.
No out of pocket expense.

CONS:
"Something this easy can't work" mentality. (Duhhh...)
"But I have 500 machines" excuse (uhh...try a group policy push..)
"This doesn't disable the entire USB functioning which I need" (uhh...substitute Microsoft's suggestion into the .cmd or .bat file)
"I just don't like you or your silly working solutions" (Can't please everyone!)

Have I missed something here?