Would like to programmatically set Mach to a jog feed override mode (not sure if this is the right terminology).  ie Hold the shift key down and then jog so that you are in a rapid jog when you hit one of the arrow buttons.

example: jog x positive in continuous mode in rapid mode.  I have tried:

doOEMButton(204)                            // Jog mode Continuous
doOEMButton(202)                            // Feed override Jog
doOEMButton(307) or jogOn(0,0)        // Jog X-axis positive

The 202 has no effect, is there another command to put Mach into the jog override and one to take it out?