I would like to be able to shutdown without opening the application menu.
Open pcmanfm-qt to /usr/share/applications.
Scroll down till you see the item "Shutdown".
Drag the Shutdown icon to the quicklaunch area of your panel. Ensure you see a little green circle with a + sign before you release the icon onto the quicklaunch area.
Now, if you left-click on the Shutdown icon in the quicklaunch tray, you'll see the shutdown option.