cmsfn.inherit() only supports the inheritance of mgnl:component nodes and only if they have a property "inheritable" set to true. Switching to the inheritAll configuration (which can only be done when modifying the TemplatingFunctions code) does not help either because "inheritAll" still limits to mgnl:component nodes.

A plain inherit() should support inheritance of all nodes and properties. For special needs (e.g. component inheritance in the extras area) this can still be specifically limited.

See http://forum.magnolia-cms.com/forum/thread.html?threadId=7f5f6891-d0d7-4ee5-a450-7337e077bb26#9dd9bc59-8796-43e1-9dbc-951646612ce1 for more info.