/usr/libexec/gnome-panel-add do apparently not work at all in 3.2.
gconf /apps/panel/toplevels is always empty - even when running in fallback mode - and it is thus not possible to specify a valid panel.
I have lost track of the different kind of gnome config and how they relate, but AFAICS it would work if it used dconf /org/gnome/gnome-panel/layout . Perhaps the program just haven't been updated to 3.x? In that case it should be fixed or dropped.
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