If you jam over the rudder you will stall the boat and blow the tack. Cats have two pivot points, not one, so you have to steer it through the tack where in a mono you would put the tiller hard over. Even then backwinding the jib is often needed, esp. if there is a lot of weight in the wrong part of the boat (which may well be true if you have a lot of inexperienced people on board).
If the wind is piping up and the seas are kicking up you will want your weight aft so you dont dig the bows into the back of a wave.