I've played it a few dozen times, and can't think of any reason why you shouldn't use it. In multiplayer, I'm reasonably confident that it gives all players the same modes (at least, when tournament mode is on).
I think you should probably make players aware that they have X seconds to drop the targets to start 6 ball MB. Because it's timed to just the beginning of the ball, if a player doesn't know that, they're at a massive disadvantage to players who do. (For some reason in my mind this is different than knowing other game specific rules...but maybe not?)