I also started this way to modify the MKS source before i found this code is much older and with issues than the released binary versions. Finally i used the last working binary for the MKS v1.1 board with good success. To also switch the laser fan you need to do an hardware modification and I like to avoid this. To keep the air assist and enclosure fan running for some time after the job is finished im thinking to add an finalisation script in Lightburn.