I have made a few suggestions in Feedbug regarding the gaps in FL's catalog in patristic exegesis and interpretation. These would be excellent additions to pre-pub and base packages. Please upvote in feedbug to voice their importance to biblical research.
Origen: On First Principles (John Behr)
This text evidently is not in Logos right now. So beginning with this translation would be a very good idea. This contains Origen's hermeneutic method according to himself and is very insightful for his method of biblical interpretation.
Ante-Nicene Exegesis of the Gospels (6 vols.)
This probably-public domain text is referenced as a source for Origen in the Ancient Christian Commentary series and would ideally help link those texts in the app. It contains much more than Origen; Hippolytus, Eusebius, etc.
The Cambridge Edition of Early Christian Writings (4 vols.)
This contains a lot of confessions/creeds of early heretics that are not extant in Logos right now, but should be (as well as early council horos and canons). Plus it contains relevant secondary material.
The Homilies of St. Gregory Palamas
Yes please
The Philokalia (all five volumes)
Shocking this isn't already in the catalog. This doesn't quite fit the same category as the above works but it deserves our attention and love anyway