Adding a roster update during a Season

Does anyone know if it is possible to add a new roster update, (ie: change the players.dbf file) during a season in progress. I know that in Live2K1 this could not be done & was frustrating as the new NLSC roster releases could not be incorporated into my ongoing season...meaning I had to continually mess with the roster myself to keep it up to date with the real NBA, (as I like doing). Can this be done in Live2K3 or will it still causes crashes & screwups when viewing league leaders stats etc in the game