Being one of those "scholars" who argue over such things, I thought I would offer a book suggestion on the Romans' topic -
The textual history of the letter to the Romans : a study in textual and literary criticism
Gamble, Harry Y., 1941-
Publication info: Grand Rapids : Eerdmans, 1977.
ISBN: 0802816703
Description: 151 p. ; 25 cm.
Note: A revision of the author's thesis, Yale, 1970.
"This volume is a thorough and detailed study of the transmission of this letter in the early church, with a consideration of the shorter forms that circulated at various times and areas during the first centuries of the Church." - Bruce Metzger "Gamble examines the structure and composition of the New Testament letter in a way that not only contributes to the understanding of Romans, but is also of great value for Pauline studies in general. He shows himself master of the details of this intricate problem and of work on the Pauline letters as a whole." - G. D. Kilpatrick
It just seemed the scholarly thing to do!