Re: Toal, M. F., ed. The Sunday Sermons of the Great Fathers. Translated by M. F. Toal. Vol. 1–4. San Francisco: Ignatius Press, 2000.

As a user, I have no easy way of translating PL 15, 1814 into something meaningful. First, a search is complex as the format is inconsistent across resources e.g "PL 15, 1814" or "PL15:1814" or "PL 15: 1814" or ... However, these are a very common form of reference in biblical and church studies. Second, as the Migne series are not in Logos, there is no reason to assume that a corresponding milestone scheme exists which could be linked to.
I propose a simple tool that allow one to move from the Migne reference to the title of the original work - yes, I mean something as simple as importing the indices for the Migne series into Logos and creating a simple interface by series/volume/page. I'm not even asking that Logos go the extra step to link the reference to the table entry - just give me an easily accessible table. I go absolutely insane finding the correct web site/web page/entry ... and it would be so easy to make it accessible.
If you really wanted to snazz it up a bit, you could map existing milestones onto it. I'd promise to be enthusiastic.