When you said "you can't jump to another team unless you save the file first", is that for MyLeague or editing simply for Play Now (or both)? If so I would try it.
So far, I tried global editing for normal play now rosters and it would only allow me to edit one team at a time and not the entire league all at once. Wish they'd bring that back. Made rosters so much easier and quicker to edit with less frustration.