Infos about writing Gnome Shell Extensions: https://live.gnome.org/GnomeShell/Extensions http://stackoverflow.com/questions/13107743/documentation-for-writing-gnome-shell-extensions
At https://extensions.gnome.org/ are several extensions about shutdown options, e.g. https://extensions.gnome.org/extension/5/alternative-status-menu/ , maybe there is yet something matching your needs?
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