great topic
Here is somthing to try. With a trainer try doing axial rolls without rudder. Then try it with rudder. A Sig LT 40 can do precise axial rolls with the right amount of rudder. Try it for fun!

another training technique is to fly a trainer on a buddy box and set the trim for level straight flight at a specific throttle setting. Land and disconect the ailerons, tape em if you want, and fly it rudder elevator only. My instructor did this to me to get me used to the rudder. A conventional trainer will fly just fine this way[8D]