A friend just took the same cruise and itinerary that we are taking next month (well, 39 days, but who's counting?).   When I talked to him about it, he said he went to Guest Services and asked them to remove all of the gratuities that were charged automatically, and that he would tip on his own for the entire cruise at the end.   Is it possible to do that?  Is it considered a little rogue?  I'd rather tip my attendant and probably my dining room servers on my own, since they are the people