Roll up window with mouse wheel

If you didn't knew, there is a nice compiz effect called "shade" that rolls up the window and hides it inside the title bar. It can be used as an alternative to minimizing a window so you have it around without occupying much space. More over, it is active by default lately in most of Ubuntu distributions (or at least 12.04 according to my experience) and it can be activated by pressing this special combination of keys:

Ctrl + Alt + S = roll up window

A more elegant and intuitive way to do the same thing would be to use the mouse wheel. To activate it, you should open Configuration Editor  (more trivial known as gconf-editor), expand apps folder and go to gwd. You should see now an entry called mouse_wheel_action which is set by default to "none". Change the setting to "shade" and voila, you can roll up and down the windows with the mouse wheel. You don't even need to click on a window, just position the pointer over an title bar and roll up the mouse wheel. To recover the window roll the wheel down.