Yes, only using a build. Either the "Main Menu" or "Menu Bar" applet, both do the same thing. Changing that gconf key doesn't have any effect, and I did restart the computer to make sure.
The "Quit" option simply doesn't exist with the build versions. I even downloaded a newer version of the source but with the same result. https://bugs.launchpad.net/ubuntu/+source/gnome-panel/2.18.0-0ubuntu2 -- source package without shutdown (feisty) https://launchpad.net/bugs/91541 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs