First of all a Cub is not a good plane to use as a trainer.
It is a very responsive airplane and not all that easy to fly even though it has a !QUOT!high wing!QUOT!.
With that said let me try to answer your question.
I have an older 60's vintage sig 1/6 cub which was designed to have a good amount of dihedral built in as it was set up for free flight, or three channel operation.
When I built mine, I removed a lot of the dihedral as it was built with ailerons and was going to use a four channel radio. If they still have the plane set up with the 2 inches of dihedral you can fly it on rudder alone, if you are using the 7/16 inch figure, you will have to make co-ordinated turns with it. The the reason you hear so much about rudder input with the cub is that on the ground it is very directionally unstable and will often turn to the left due to the engine torque. As it is a tail dragger it is necessary to use a lot of rudder to keep it on the centerline during take off to avoid the oft discussed ground loop that cubs are know to do. Also until you get some speed up the rudder is not all that responsive and you have to make what seems like large movements of the rudder as you start to roll, as you pick up speed the rudder becomes more responsive so only slight movement make it yaw fast. This is one thing that is a bit hard to get a handle on but becomes automatic with experience flying. Now I am not slamming the cub it is a nice plane and i have a couple of the myself , any tail dragger has the same problem and that is why most trainers are set up with trike gear they are much easier to handle on the ground.

It is my opinion that computer mixing used when learning to fly is a bad thing. But that is just my opinion....