I don't know. The architecture depends on the idea that each gallery has one album that serves as the user albums' container. Changing that could open a can of worms. Maybe you can do something where each school is a gallery that is accessed via a specified URL (schoolA.aspx, schoolB.aspx, etc). Then you write a separate page that helps them get to the right destination. Read more about the gallery concept in the Admin Guide.
I don't fully understand your requirements so I may be way off base...
Roger Martin
Creator and Lead Developer of Gallery Server Pro