Whenever I need to shutdown or restart, I "dip" the mouse pointer down into the lower right corner and immediately move the mouse pointer up a few inches. The Charms Bar slides right under the mouse pointer with the "Settings" button directly underneath. It takes a little practice to remember exactly how far up from the bottom the screen the Settings button is oriented, but this "dipping" motion is easy to do since you don't have to click to invoke the Charms Bar. It's almost like a gesture.