Yes I know this. Wherever I can I tend to use keyboard shortcuts instead though, so I can keep my pen/mouse on the main image and I don't have to travel across to my second screen (where I keep the tools/color/layer windows) to click on a rather tiny button. It would me save time and uncessary mouse movements, in the same way as using the "S" command to select and "P" to use the pencil is a lot quicker for me that having to click that particular button on the Tools window.