In a classroom setting, using it as anything other than what it is intended to be--a language--is disrespectful and counterproductive to ASL and the people who use it. What you propose is akin to training a dog to follow commands of hand gestures. It would teach the children not to respect ASL as a form of communication, but as a tool for being commanded. That's a horrible way to think of ASL.
If the teacher wants to use ASL as a way to teach appreciation of other languages, the same way Spanish might be used in a class for instance, then I absolutely would encourage it.
