Apologies if this was posted already, but I found a way:
1) Have your rosters loaded
2) At Campus Legend select, choose to use an existing player (If you want to use your own guy, create him at the original roster menu)
3) Choose your player
4) When asked to generate player names, choose "No"
It seems to work for dynasty mode, but it doesn't work at all for Campus Legend. Maybe the trick is in using an existing player rather than creating your own guy, though.
Yeah, you *have* to use an existing player. You can create a player at the main menu and select him from the existing players, though.