KTM, stick scaling is a way of altering the imput to make it more or less sensitive to inputs. Almost all flight sims have this one of the reasons is because everyone has a different stick.
In-game you can find it under options, controls, map controllers. Select the axis you want to scale and click advanced options- this will bring up the stick scaling menu below:

My axis for the elevator (and rudder) is like this:

This makes my stick less sensitive at low inputs allowing for minute corrections when aiming instead of having the nose bounce everywhere, this is what lynx was talking about. How sensitive a person has their stick is a personal preference.