Robert,
You are correct that we intend to correct this limitation to the medication record by allowing links to providers (in fact, I just replied to another post of yours where linking to providers would have also been useful).
Medication refills is an interesting area we hope to greatly improve by our next major release. In particular, we believe "pill management" - including supporting tracking information such as the one you brought up, tracking valid dates - will be much more evolved. We hope to get more feedback from individuals who manage multiple medications and for whom remembering to track all of their medications and refills is a significant effort.
Thanks!
Support Team