[Zope] Creating new permissions -- outside a Product ?

I am creating a site, where I use mostly standard-components, DTML-methods, Zwiki, Kubes etc. I manage users by roles, but would like to create additional permissions. Is it possible to create permission outside any product -- or should I create a dummy-product that introduces these new permissions I want to use with my dtml-methods and PythonScripts? -huima