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Didn't intend to answer my own question, but I found this March 2011 Bloomberg article:

Apple Inc. (AAPL) is weighing an expansion of its AirPlay audio service to include streaming video from an iPhone or iPad to television sets, according to two people familiar with the project.

Under the plan, Apple would license its AirPlay software to consumer-electronics makers that could use it in devices for streaming movies, TV shows and other video content, said the people, who asked to remain anonymous because the plans haven’t been made public. Apple now only licenses AirPlay for streaming audio. Devices that could be used for video may be available this year, one of the people said.

So apparently the answer is "not yet, but maybe in the future."

I would suggest, assuming the main function you'll be using is AirPlay, that you give each classroom's Apple TV its own AirPlay password that only the instructor in that room knows. That way, he/she can connect to it with the credentials you've given and no one else can. If a student needs to connect to it to show something, the instructor could put in the password on the student's laptop. Obviously, if the password gets leaked you can change it at will.

I know this seems a little tedious, but I think it's the only way of doing it short of re-subnetting the building (I understand why you'd want to NOT do that!).

Also, I would suggest you create DHCP reservations for each Apple TV on your DHCP server so they always get the same IP address when connecting, just in case your network gets overloaded. Just a suggestion.

Hope this helps a little. Good luck.