Password protect netinstall starting up

Hi,
I currently manage an educational lab of 40+ computers, all connected to an Xserve. What we have been finding is that students have discovered something fun happens when you press and hold N when starting up (which finds out netinstall image on the server). The problem is that 1) if the students re-image the machiene by just 'clicking through', we dont know about it so the post-image tasks aren't completed and 2) through the options menu they can change the Open Firmware password and the Admin password. Can anybody suggest a way to stop this from happening i.e. password protection before it even gets to the netinstall setup?
Thanks

Setting up firmware password protection...
http://docs.info.apple.com/article.html?artnum=106482
Check the list of machines it can run on though.

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