If you want to do Keyboard Jogging, then use the native mach3 hotkeys for jogging since the stop code is already in that.
if you want to control jogging from an external source, then use the PoKeys (one option).
You can bring in your jogging keys, and speed reference inputs on the PoKeys. Then map those to USER LEDs (see the plugin configuration screen).
Read the Help me file, (see button same name on the config pokeys).
Once you map your inputs to ULEDs, then use a "Brain"
i.e. here is a few rungs that would fool with the X axis
ULED2000->NoOp->Button Jog X++
ULED2000->INvert->Button stopJog X++
ULED2001->NoOp->Button Jog X--
ULED2001->INvert->Button stopJog X--
ULED2002->Fromula (A*50)->JogSpeedDRO (this will make the jog speed 50%)
scott