How can you disable "set desktop picture" from the finder contextual menu

I teach high school. And MUST find a way to keep my students from changing their desktops.
First I basically got rid of Firefox when it had that feature in the Tiger days.
Then for Leopard I had to create dummy "locked" Safari Desktop Picture files for all my user accounts so the kids couldn't use Safari to set their desktop pictures.
NOW I discover (maybe this was here before) Snow Leopard lets you change the desktop right from the Finder itself! Just right click on any image file and the contextual menu will give them the option to "set desktop picture".
Come on Apple, every educator I know has complained about what a distraction and constant battle images are for students who use computers. While not all students are inappropriate, quite a few are...meaning no one can be allowed the privilege. Why is this such a huge battle to try and lock down? Please allow Parental Controls or Server managed preferences to keep our students from being able to change their desktop pictures, ever, at all, from anywhere or any program.
Does anyone know if this is even possible?

The only way (I have found) to shut down using Safari's "Use Image as a Desktop Picture" feature is to create a bunch of blank documents that the users have no permission to change (i.e. set permission to only allow, say YOU to read it and no access to write to it for anyone)
Create a number of these blank documents and rename them
Safari Desktop Picture.jpg
Safari Desktop Picture.tiff
Safari Desktop Picture.gif
Safari Desktop Picture.jpeg
Safari Desktop Picture.png
(you get the point....come up with as many .3 extensions of photo files that you can think of)
Put these locked and unchangeable files into the following directory of each of your student accounts
Macintosh HD/Users/~User Name/Library/Safari/
What this does is create a bunch of dummy files that will "block" Safari (or the system or user) from trying to replace them. Even though the right click comman will still be there, Safari will not be able to put the picture in the correct part of the system for it to be used as a Desktop Picture.

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