with rosters getting more complex (more leagues, more players, more things to update), I think it would be super helpful to get more merge options at least for players.
At the moment we can only merge players in a complete way.
What would be cool in addition:
a) allow to update specific things (contract data, player rights, awards, player retired, ratings)
b) update&insert function (if player exists - update; if player does not exist - insert)