Could it be possible to add a feature to cross reference all the Early Church fathers and could be expanded into other things as well. So many duplicates of the writings can be found. For Example I am using the ACCS series on Romans. You got to Romans 6:2 Ambrosiaster has a note on that verse it references Commentary on Paul's Epistles Note 8 calls for CSEL. I do not have CSEL in my library. Yet I do have
Ambrosiaster. Commentaries on Romans and 1-2 Corinthians. Edited by Thomas C. Oden and Gerald L. Bray. Translated by Gerald L. Bray. Ancient Christian Texts. Downers Grove, IL: IVP Academic: An Imprint of InterVarsity Press, 2009.
This provides the same information as CSEL referenced in the ACCS collection.
It would seem to be fairly easy with your resources to look and Say I have a reference for CSEL or any other source what other Early Church Father writings has the same information. So when you press the Reference the database would pull up the resource you already have on your computer that matches that information.
The reason I would like this is that I read the quote in ACCS and want to review the whole source where it is referenced when Possible. TO get an idea of the Complete ideas being expressed. And I often forget all the different Books I have available in Logos. It would be a nice feature to have a cross reference of sources to say you have the book that talks about this subject and would speed up research even more for those who are doing deep studies in various subjects. Where the original source is not available but the similar information is available here that you have already purchased.