Voiceover: I need to get rid of it

Question

I am in charge of a lab of 30 iMacs running the latest version of Tiger. Each machine has 5 local accounts. When they were set up, four of the accounts (the student use ones) were locked down from opening any System Preferences.
Recently, kids have begun using Command-F5 to start all the machines in the room talking and I got a chuckle out of an email I received from her indicating that it's driving her bats. She asked (pleaded with) me to do away with this voice stuff.
I found another post on these forums that suggested I try to accomplish this by moving the /System/Library/Speech folder to the localadmin desktop and see if that cures the problem.
It did. However, when you press Command-F5, the black box appears as it does with Voiceover, but Command-F5 no longer acts as a toggle. Pressing Command-F5 again does not toggle the feature off so the black box remains until the machine is restarted. Another teacher who uses that room is complaining that the box is a nuisance and wants it removed.
I've done a few things, namely, putting the Speech folder back where it was and just moving the three sub folders to the localadmin desktop. Voice is still inactive which is good but the black box remains. I've tried leaving all the folders in the Speech folder intact and just removing the files from them but the issue persists.
This is a very active lab and in order to disable this the usual way would be to manually uncheck the Voiceover options in Universal Access. To accomplish this I would have to sit at each machine, log in as local admin, give the account permission to open System Prefs, log out, log in as the local account, change the setting, log out, log in as admin again and remove the access to System Preferences. Rinse and repeat for the other accounts on the machine.
I'm trying to avoid having to do this and wondered if anyone else here might have found a way to get rid of this feature without all this extra legwork.
It won't be a problem for next year as I will update my image to disable Voiceover but for the remainder of this year I'll have to come up with some solution.
Thanks in advance for any help.

Answer 1

{...When changing Universal Access in a computer lab, open and
available to all students, one has to consider the consequences
of blocking the features which Universal Access affords those
students with disabilities and given the outcome this may be a
blanket answer to a situation of abuse by students without such
a need to use this feature set in the computers they use, another
issue may arise from discontinuance of this feature set...}
If there are no assigned computers set aside for students requiring
the features afforded them in Universal Access, and all computers
are set (perhaps a script could remotely remove or disable features
via an enhanced single-user or other workaround) to disallow U.A.
then someone would have to assure those needing this access will
have specific computers whose feature set remains intact.
This is just a thought. I don't use the Universal Access features,
but not unlike some owners and users of the OS X, I have had
an accidental encounter early on, given keyboard commands.
Also, is the black box you've heard about when the VoiceOver is
semi-disabled a text box? There is a toggle or checkbox in V.O.
to have a text box; whether or not this can be modified to get
rid of a black box appearing on the screen is an unknown.
The idea of re-mapping the keys so the command isn't possible
may be one idea worth considering; if it can be done remotely
or offsite, not requiring you to manually do each Mac.
In any event...
Good luck & happy computing!