2. Use custom menu layout. The official GNOME menu layout adds some
additional categories, which may confuse users. Reduce them in our
custom menu layout file.It is not that simple as you think...We patched ubuntu in similar way. Only custom menu file was added to gnome-menu package and gnome-panel.desktop file was edited to set XDG_MENU_PREFIX. This is only workaround and still does not solve problem fully. That is way I created this patch - https://bugzilla.gnome.org/show_bug.cgi?id=732548.At least one problem is that Alacarte (menu editing) program will use menu file XDG_MENU_PREFIX "applications.menu". That means users trying to edit menu will see different menu from what is available in gnome-panel.To properly fix this bug we need above patch accepted in gnome-session or other way to set XDG_MENU_PREFIX for whole session.I have not tried, but there might be a way to change XDG_MENU_PREFIX without above patch:
https://git.gnome.org/browse/gnome-session/tree/gnome-session/org.gnome.SessionManager.xml#n8But then we need application that will be started in initialization phase and set up XDG_MENU_PREFIX to "gnome-flashback-". gnome-session set it to "gnome-". If this would work then I would probably do this:1) Create new application gnome-flashback-init that will be run in initialization phase. At least for now its only task would be to set XDG_MENU_PREFIX.2) I would add our custom menu in gnome-flashback module as it was made for this - place where to add all missing things for our session. It should be named gnome-flashback-applications.menu3) Update gnome-panel to use XDG_MENU_PREFIX "applications.menu". This way file name would not be hardcoded.I will try this after sending this mail.