I'm not exactly sure what you mean by that, what do you mean by a roster template and also what do you mean by a universe league?
EDIT - By changing the player type you mean as in a player being a 'bucket getter' or 'glass cleaner' etc? Those are denoted by certain attribute thresholds as far as I am aware and in turn, those attributes are generated by real life performance data from the previous season. So a player type is defined by that particular players real life performance stats.
If you're interested in some info on database editing, here is a link to my post for the updated rosters from the mod section of the forum, someone asks me how I made the changes to the database and I tried to provide a comprehensive overview. Let me know if you have any other questions!
viewtopic.php?f=328&t=34064