I also looked (and thought) high and low for this and only found unreliable ways of doing this, so developed our own.
SAP consulting also use it and offer a service with it if you want the work to be done with it for you -> see SAP Note 1682316 ( https://service.sap.com/sap/support/notes/1682316 )
You then end up with roles which have standard status authorizations with complete where-used-lists to the FM's.
Cheers,
Julius