Good idea, I may get one for other uses. Not knocking what John wants to do, each to his own. But, I have a slight fear of things that can cut off my fingers faster than a blink. By deliberately not having a dedicated, single switch shop vac/CMS I am forced to take time, even if only a couple seconds to ponder what I am doing before starting the evil spinny thing. For me, it is just a little exercise in added caution.
"Folks is funny critters."
Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire