Final settings (for future use by anyone interested):

```
config.g
-----------------------------------------
; Drives
M584 X0:3 Y1:4 Z2 U3 V4 P3; Three axis visible
; Tools
M563 P0 D0
; Drive direction
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1
M569 P4 S1
; Steps and Speed
M92 X80.00 Y80.00 U80.00 V80.00 Z4000.00 ; Set steps per mm
M566 X900.00 Y900.00 U900.00 V900.00 Z12.00; Set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 U6000.00 V6000.00; Set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 U500.00 V500.00; Set accelerations (mm/s^2)
M906 X800.00 Y800.00 Z800.00 U800.00 V800.00 I30; motor currents (mA) and motor idle factor
M84 S30 ; Set idle timeout
; Axis Limits
M208 X0 Y0 Z0 U0 V0 S1 ; Set axis minima
M208 X600 Y400 Z100 U600 V600 S0 ; Set axis maxima
; Endstops
M574 X1 Y1 U1 V1 S0 ; Set active low and disabled endstops
homex.g
----------------------------------------
M584 X0 U3 P5; split steppers, 5 axis visible
G91 ; relative moves
G1 X-650 U-650 F450 S1 ; fast homing X and U in parallell
;G92 X0 U0 ; Make adjustments to square axis here
M584 X0:3 P3; join steppers, 3 axis visible
G90
```