In a training scenario when I am letting the student share their screen to help them through an issue I would like to be able to toggle on the pen tool and show them where they need to click. A lot of the time these students are computer illiterate so asking them to find the drawing menu to toggle it on would be a task in itself. I Know I can just take mouse control but then they are no longer learning and just watching. If that worked they would have learned during the presentation. "Give a man a fish, and you feed him for a day. Teach a man to fish, and you feed him for a lifetime".