When pushing a feature to Pivotal Tracker, a user can select a mapping that allows for initiatives to be mapped to epics. The only initiatives this works for are initiatives directly referenced by a Feature. Any initiatives referenced by the Release (or Master Release) that feature has been assigned are ignored.
We currently have the capability to link strategic initiatives to both releases and features. A common use case is that while the general strategic theme for a release may be linked to a specific initiative, you may have features which link to and span across multiple initiatives.
At this time, we do not have plans to make updates in this area due to community feedback and current priorities. We hope you can understand.