I´am using Ligthburn running my DIY grbl based CNC laser. In addition to that I have also built a small circuit to analyze the pwm signal for the laser intensity tuning into servo movements. This little device can be substituted with the laser to lift and release a plotter pen. Thats works great (in theory… 
Laser intensity >50% will release the pen to draw lines; Laser intensity <50% will raise for travel.
I´am absolutely aware that ligthburn is no plotter app. But is there any chance to insert some delays such as: wait 500ms after activating the laser and wait 500ms after laser off ?