The gnome-panel code (in gnome-panel/panel-util.c) has hardcoded references to the screensaver programs.  It seems it would be be good to get rid of the hardcoded references to gnome-screensaver/xscreensaver commands and instead just use xdg-screensaver.  However note that gnome-panel also needs to run the preferences GUI program for the screensaver, so the preferences programs (gnome-screensaver-preferences and xscreensaver-demo) are also hardcoded.  However xdg-screensaver does not support any options to launch the preferences GUI for the appropriate screensaver.

I think it would make sense for xdg-screensaver to support an option (perhaps "-prefs") that would just launch the appropriate preferences GUI program.  This way we could get rid of hardcoding the screensaver and screensaver preferences GUI commands in the panel code.

Below I am showing the code in gnome-panel which shows the hardcoding of the screensaver command and the screensaver preferences GUI command.

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        if (panel_is_program_in_path ("gnome-screensaver-command")
            && panel_is_program_in_path ("gnome-screensaver-preferences"))
                use_gscreensaver = TRUE;
        else if (!panel_is_program_in_path ("xscreensaver-command"))
                return NULL;

        if (strcmp (action, "prefs") == 0) {
                if (use_gscreensaver) {
                        command = g_strdup ("gnome-screensaver-preferences");
                } else if (panel_is_program_in_path ("xscreensaver-demo")) {
                        command = g_strdup ("xscreensaver-demo");
                } else {
                        command = NULL;
                }