Yes, see link above, except for that there seems to a limitation how many fontawesome icons can be displayed.
Update: There isn't. It's just that certain icons did not seem to work. However, the real reason was that I wasn't using the exact icon code.
Update 2: The sign-in/sign-out icons on menu item 5 definitely aren't working, nor is the toolbox icon (link to backend) on menu 6. If you hover on the item it tells you what the link is about and, if you click on the link, it is actually working. It's just that the icon is not being displayed.