It would be helpful if one of the mapping options with Pivotal Tracker could include the following options:
Instead, the only option for mapping to Epics in PT is to use Initiatives. That was probably the case before master features were created so perhaps it's time to upgrade the PT mapping.
Even in Aha's live and recorded product demos, Master Features are referred to as Epics, and Features referred to as User Stories. I understand that Pivotal Tracker's data model for epics and user stories makes this type of integration with Aha! a non-trivial task. Nevertheless, this mapping option is definitely the most logical.