You only scale your stick up to 90% because when you move your stick to 100% that is what you get.
Either you don't realize that or I don't understand what it is you are saying.
Are you wanting to limit the 100%?
I use a pretty slow reacting setup on my stick, but when I move the stick to it's stops that is what I want, 100%
I use a setup that makes the little line in the graph look like a fishline, with a belly in it about mid way, and it gets straighter the higher percentage of stick movement I use, in other words, it follows the permanent diagonal line towards the end.
If you are wanting to limit the controll movement then the stall limiter may be for you. I you want to maximise how "realistic" the plane flies for you and want to be smoother ( reason I use the fishline graph) then I wouldn't think you would want to limit overall stick input.
I may be misunderstanding you guys and please correct me if I am assuming something that is over my head.
P.S. Something you don't want to do when using the scaling is have a low value in the last three, the 70, 80, and 90% , because if you do it will jump when you hit the stops. Make it gradual. Actualy, make all the values a fairly gradual change from one to the other. Just make sure you are fairly high in the last three, especially the last one.