Hi guys
maybe too late but i just face this slave homing problem with ipm

I find simple and free solution

in cs plugin config i turn off Y (or X depend of your machine ) slave axes is A ( to none )

than Mach do homing and squering same way like smooth stepper do
DoButton( 24 )
DoButton( 23 )
DoButton( 22 )
DoButton( 25 )

after this i turn on Y slave A in cs plugin and machine work perfectly
its just few click in the beggining
hope its helpful

Jasko