Just a thought since I can get the "Packaging Configurations" option in my Eclipse project properties....
From Eclipse try: "Help" | "About Eclipse Platform" and then click "Plug-in Details".
My resultant plug-in names listed include "JBoss Packaging Core Plug-in", "JBoss Packaging UI Plug-in" and "JBoss UI Plug-in" (amongst many more JBoss ones).
If you have not got these, you will probably need them. If you have already got these, then I have wasted your time (and my apologies for that).
I've got them, but can't use them. :(