I know there has been massive freakage over how to handle the newest opening day rosters... though the answer seems simple to me (correct me if I'm wrong).
When you start your franchise, control all 32 teams and go in and release all the fake UDFAs it puts on each team. They will disappear. If you do this all in the first week of the pre-season, the game won't force you to cut any players since you are already under the max allowed. Barring injuries, once you arrive at the regular season there should have been no major changes, unless necessary to fill spots due to injury.
Voila.