For full scale planes this is a good explanation http://www.airbum.com/articles/ArticleRudder.html
That is full 3 axis control with a pilot inside. Because we stand outside for flying it is easier to mechanicly "fix" the plane so it can be easer to learn. We add more dihedral so we dont have to be chasing it as much while we learn. After we know what to do, it can be a hinderance. Also Big planes have required handling chariteristics that have to be met from the FAA or such to be certified. On a big plane in a cross wind landing, you dont want much roll when you yaw with rudder because you are cross controlled with the ailerons. Ailerons turn you into the wind while the rudder keeps you on course. If the rudder rolled too much you might run out of aileron control to counteract and stay in control. I like flying rudder/ elevator planes some times; easer for just flying around but more difficult to fly precisely; fun to do things differently.