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To make it easier to add menu items, could Geany be re-programmed to dynamically create that menu based on the templates included in ./data/templates and ~/.config/geany/templates , thus allowing users to add licenses to their own systems?
PS Since you really should add the license when the file is created, not paste it into a file later, what I do is to add licenses as file templates http://www.geany.org/manual/current/index.html#file-templates which appear in the create dropdown list. Things like apache.hpp and apache.cpp for example.
Cheers Lex