Please don't add more arguments to org-get-heading. It used to have 2, then it had 4, and now you want to add a 5th. Every time the function's signature changes, it breaks code in third-party packages and user code in random places, which requires the addition of messy compatibility code and intermediate functions that do nothing but wrap org-get-heading with a certain number of arguments.
It would be much preferable to make a new function that uses keyword arguments so the addition of more arguments won't affect existing code. Maybe it could be called org-entry-heading.
