phil,
Jogging from other than the physical keys will be an issue for you. UNLESS.... if you bring in an input that represents jogging to an ULED, you will have to build a Brain, OR, macro pump, that when the LED is ON you jog this or that axis this or that way, and when it is off you stop the jogging. You have to tell mach to STOP jogging once jogging is started from anyother source than the keyboards. The Brain has both start and stop jogging functions that you will need to set up the logic based on your inputs to start and stop the jog.
scott