I'm no instructor: But...
I would encourage people or instructors to get students well and truly comfortable with rudder/aileron control in the air (e.i. not in the landing phase) by doing many different exercises. You can only tell someone so much about how to control a machine, the rest they have to find out themselves by trial an error/instructor patter/and demonstration.
Tail wheel aircraft are good as you have to start as soon as you start taxiing, and most of them are spring actuated which requires more finesse than direct rudder pedal to wheel connections..
Everyone learns differently as well - some want to be told how much/when should I?/tell me, tell me! Some rather figure it out themselves and hate being corrected all the time. Others learn by example. etc... et
But regardless there comes a time when you need the person to 'figure' it themselves regardless. That's when the teachers job is to encourage independence.. but I think there has to be a fine line to how much, don't let the student get to 'snowed' under that they lose focus altogether. You are stretching them slowly into a new skill.
Anyway I've gone off on a tangent again... moral of the story - how much rudder do you use on final? I think that question is very similar to someone asking how much should the steering wheel of a car be turned for a left turn... just put that nose where you want it! BUT, the key word is understanding, you can tell someone something till you're blue in the face, but if they don't understand what you're talking about they won't get it.
I love doing this: pick a point, wave the wings left/right while keeping that nose on the point with rudders - try it at different speeds