Okay, so let's say you already have a group together that has a Force user. Up until now, Morality hasn't been incorporated (because, obviously, it was an unknown mechanic); would you apply it to the game? Is it fair to do so, given that the player has gone thus far without it?
So far, I am tempted to use of the rule of "If you don't take anything from FaD, you don't need the mechanic; but if you do, then you need to take on Morality." This mechanic's sudden manifestation could be justified by the character becoming stronger with the Force, and thus experiencing a greater pull from both sides of its dual personality, light and dark.