@Jorge_Robles I was thinking of a more universal aproach to add a pre- and post-gcode field to each operation (no toggle or settings). This way, someone could add M8 or even a pause or tool change before or after a certain operation.
So we add Pre/Post Operation and Pre/Post Pass on settings as we have Start/End job, leaving current air assist implementation, isn’t it?
No, I mean a pre/post gcode field on each operation (where we config the operation, like power, feed…), not in settings. The user could then set gcodes to these fields when needed, but would have to do it for every operation separatelly (not so convenient).
The other option would be to leave the current air assist config in machine settings and add an air assist toggle to each operation, but then we would have to do the same for flood and mist (and what ever someone needs).
@cprezzi there’s already an air assist on each operation if machine profile have it enabled 
I will open an issue so we have it centralized