Is it possible to calibrate the faders ?
New function for V1.9 ???
Mosky
Sadly no, not currently. And as we have not seen release notes for 1.9 one can only speculate, or break NDA 
If it’s dramatically off, this can be a sign there is a problem with the fader bank itself and can requite repair from a service center
iDR-48, T-112, Mixpad
College
It’s not dramatic, but I know that it is not currently possible…
I have only one fader that is not calibrated, it is only a wish because many other console offers this feature !
“Sorry for m’y english” !!!
Mosky