hello, 
i use the FS9 with reg. FSUIPC 3.804 and saitek x52 joystick. today i want to use the first time the axis assignment with fsuipc. i delete all axis assignment in FS9. After that i calibrate the axis in FSUIPC. 
Only one axis (the big rotary knob on the throttle "Y-Rotation" is not possible to calibrate ??? Then i tested the same in FSX with 4.26.  There the axis is avalible as Axis "V" 
FSUIPC.ini from FS9: 
[JoystickCalibration] 
ExcludeThrottleSet=Yes 
ExcludeMixtureSet=Yes 
ExcludePropPitchSet=Yes 
SepRevsJetsOnly=No 
ApplyHeloTrim=No 
FlapsSetControl=0 
FlapDetents=No 
AileronTrimControl=0 
RudderTrimControl=0 
CowlFlaps1Control=0 
CowlFlaps2Control=0 
CowlFlaps3Control=0 
CowlFlaps4Control=0 
MaxSteerSpeed=60 
MapThrottle=Yes 
Throttle1=-15993,-11052,-5851,16256/8 
ReverserControl=66292 
Reverser1Control=66422 
Reverser2Control=66425 
Reverser3Control=66428 
Reverser4Control=66431 
MaxThrottleForReverser=256 
Aileron=-16380,-512,512,16380/8 
Elevator=-16380,-512,512,16380/8 
Rudder=-16380,-512,512,16380/8 
Spoilers=-16380,16380/24 
Flaps=-16383,16384/24 
[Axes] 
0=0X,256,D,1,0,0,0 
1=0Y,256,D,2,0,0,0 
2=0Z,256,D,4,0,0,0 
3=0R,256,D,3,0,0,0 
4=0U,256,D,22,0,0,0 
5=0V,256,D,23,0,0,0 
FSUIPC 4.26: 
[Axes] 
0=0X,256,D,1,0,0,0 
1=0Y,256,D,2,0,0,0 
2=0Z,256,D,4,0,0,0 
3=0R,256,D,3,0,0,0 
4=0U,256,D,23,0,0,0 
5=0V,256,D,28,0,0,0 
6=0S,256,D,22,0,0,0