Over at Biblica, there is an article by Mark Gignilliat entitled "Working Together with Whom? Text-Critical, Contextual, and Theological Analysis of sunergei in Romans 8,28".
The text-critical issue that he deals with is whether or not one should prefer some mss that make theos the subject of the verb sunergei (supported by P45 A 81 sa [Coptic] Origen) or those that omit theos and make panta the subject (Aleph C D F G etc). There are theological implications to the text-critical choice made here. Gignilliat writes: "In other words, this text is a classic example of where text-critical arguments and internal evidence may be at loggerheads." His own approach to prefer theos for textual, contextual, and theological reasons.