Deezire's WNDedit works but I could only get it to work keeping it in its own directory, not in the Generals install directory. I think my problem is trying to edit zero hour and this program might be for generals. Try its own directory and then open the wnd file you want. Most of what your looking for in the mainmenu will show up without the need of any other files except mainmenu.wnd.

I myself am waiting for some sort of tutorial to edit the in-game shortcut menu.