This firmware upgrade was not intended to be a general purpose laser version. It is targeted to a specific audience with specific equipment. Sonny is working on the "official" laser support that is targeted for version 1.0c and he says he is close to having it ready.
However, it may work in other systems, depending on the system requirements of the laser you are using.
My version does not have separate enable/disable and PWM output. The only control output is PWM. To use it in an on/off mode (as in turning a relay on/off for spindle mode, or to turn the laser on/off in laser vector mode) you could use S(max: spindle $30, laser 255) to turn the device on and S0 to turn the device off (assuming you have M03 active).
When M03 is active S0 puts a logic low (~0 volts) on pin 11 (PWM). (spindle and laser)
When M03 is active S255 puts a logic high (~5 volts) on pin 11 (PWM). (laser)
When M03 is active S(max $30) puts a logic high (~5 volts) on pin 11 (PWM). (spindle)
When M03 is active S1 through S254 puts a PWM signal on pin 11 for laser raster mode.
M05 puts a logic low (~0 volts) on pin 11.
How is this reversed?