Rudder is an important control surface because its the first control thats effective and the last to become ineffective in flight.

Why not practice using rudder about 3 mistakes high? Practice doing forward and side slipping. Take the airplane into a stall and keep the airplane level with rudder. Control any rolling with the rudder you'll see rudder is still quite effective even when stalled.

See what happens when you use rudder only. In military pilot training we would rudder roll the T-38 Talon, although normally except for aerobatic maneuvers, takeoffs and landings we seldom used rudder. It all depends upon the airplane. When I flew C-130's we used rudder just the same as when flying a light aircraft to coordinate turns. When we lost an engine the use of rudder became very important especially if it was outboard. Two engines out on one side depending upon the speed and aircraft weight would have the pilot using almost full rudder to maintain control and a straight flight path.

There are aerodynamic reasons why rudder is not used most of the time with swept wing aircraft. That being that in a turn the outboard wing becomes effectively longer aerodynamically decreasing adverse yaw.

Experiment using rudder! Take it up high so you can fly it out, learn the envelope or limitations of your airplane.