Operations: return/in values passed by reference?

[NeilOwens]

I want to configure a function to return an object by reference.  I can use free text to make EA do this, but I would prefer to do it by checkbox somehow to maintain the link to the object class in the UML mode.  

I see that out or in/out parameters can be configured to do this, but I would like to know whether it's possible to configure this for return values or input parameters for an operation.