dual Z independent motors with separate steps per unit setting

[demodemo]

Hello. I have a machine with 2 independent Z motors which contains X and U axis respectively. The Z motors drivers are mapped together Z0.2:0.5 for both Z motors to move in sync. While they are in sync, is it possible to set separate steps per mm for each Z motor like below with Z1000.00:1020.00 ? (I tried below configuration but there is no Z movement response) So that driver 0.2 uses 1000 steps per mm and driver 0.5 uses 1020 steps per mm.

I'd be very grateful for any recommendation on how to do so in config.g. Thank you very much.

M584 X0.0 Y0.1 U1.1 Z0.2:0.5 E0.3:0.4           ; Xu, Zu, set drive mapping

M350 X32 U32 Y32 Z32 E32:32 I1                  ; configure microstepping with interpolation
M92 X160.00 U160.00 Y160.00 Z1000.00:1020.00 E840.00:840.00      ; set steps per mm
M566 X900.00 U900.00 Y900.00 Z60.00 E120.00:120.00       ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 U6000.00 Y6000.00 Z180.00 E1200.00:1200.00 ; set maximum speeds (mm/min)
M201 X500.00 U500.00 Y500.00 Z20.00 E250.00:250.00       ; set accelerations (mm/s^2)
M906 X1000 U1000 Y1000 Z1000 E1000:1000 I30     ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                         ; Set idle timeout

[Phaedrux]

Not currently possible. I will move to the firmware wishlist category.