The desired result is that you get a series of pulses of extrusion rather than random under-extrusion, so if you can't get consistent pulsing by adjusting tempe

The desired result is that you get a series of pulses of extrusion rather than random under-extrusion, so if you can't get consistent pulsing by adjusting temperature and extrustion rate, you could always hack Marlin to do it on purpose. I expect that is what they've done.