OK then let me throw this out. Would it be reasonable to use an optical tach to figure out what the idle RPM is and what the full throttle RPM is, on the ground. Then use the optical tach to set up a throttle curve so that 1/4 throttle on the stick is 1/4 of the RPM difference between idle and full throttle RPM. Then 1/2 stick is 1/2 of the RPM difference between idle and full throttle RPM. And so on. Hope this makes sense.
It depends on the motor/prop/airframe you're using,and the torque curve (not the bhp curve) of your motor/prop in particular.
What you'll get with most systems,if you use the set-up as you described,is something that has very little,and slow, response in the bottom half of the throttle stick,and then a rapid increase in power above that,with little noticeable gradation between 3/4 and full throttle.
Just as one example, what I do,with an OS 160/pipe/APC 17x12,is:
Idle---1700
Full---8300
Mid-stick----6000(i.e.1000rpm more than midway between idle and full)
Then,as Troy said, I have a fairly steep upward rise in the throttle curve just immediately above idle,as the response is slow just there.
That sort of set-up gives me what I think I need----a smooth response to the throttle stick---in the air.
With the current set-ups in use,just from my experience, I'd say that piped 2-strokes are the most fussy in throttle curve requirements, some of the electrics require much the same sort of curves, and the YS 160s are far less critical---as long as you move the stick somewhere,it'll do what you expected it to without much bother!