The information given at: http://docs.kali.org/live-build/customize-the-kali-desktop-environment

provides missing information for xfce4 installs. For instance the Offensive Security Gnome version of Kali provides a 'Places' menu that is not available in xfce4 as described by the link given above without including:
xfece4-place-plugin
in the xfce build config entry at the aforementioned url.

Not a big deal but it means out of the box xfce doesn't work like people coming from mint or a similar xfce experience think it will.