Annoyed at the Control Key? Look Mom, No Hands! lets you open contextual menus by just holding the mouse button, keeping your other hand free for the coffee cup.
With this small application (it's a prefpane), you no longer have to press Ctrl to open the contextual menus. Click on an item on the desktop and keep holding down the mouse button. After some time, the standard contextual menus will pop up, including any Contextual Menu Manager plug-ins you have installed.