We have Epics that are repeated and whose stories cross sprints.  We would like to be able to duplicate the stories when we duplicate the Epic (similar to the option to copy sub-tasks when we duplicate stories). 

An example use case:  Releases - We follow specific steps that are replicated for each release:  Implementation Planning, Regression Testing, Rehearsal, User Testing, etc. 

Since we deploy monthly, you can see how painful and time-consuming this becomes, plus it makes it easier to forget a step if we are building or replicating them one at a time.