I have a machine with 4 spindles. For the tool offsets I'm using M52 commands im M6 macro.
All four spindles are driven with the same frequency inverter
All is working fine 
I'm using M6 Tx command to automatically set correct M52 offset in my G-code.
The only problem is that M6 automatically shut down spindle when it is executed.
This I do not need since I do not change the tool "phisically" in any spindle)
At the end  of my M6 macro (G52 offset) I need to turn spindle again On (or in my G-code after M6 command)
That makes delays in my work 

Is there any option to set Mach3 not to shut down spindle when calling M6?
(Also the completely empty M6 macro shut down the spindle)

Thanks