We had yard duty ladies all over the place, and our bathrooms had a monitor as well, so no sneaking off for a smoke. If kids wanted to fight they'd have to go off campus or in the alley behind the school to do their business.
Bullying has escalated dramatically in the last couple of decades. I suspect a little supervision would go a long way.
this is actually a really great idea. Have not seen it implemented but I bet it would really cut down on things.