Air Assist on Marlin Firmware

I’m trying to hook up air assist on my MKS 1.4V board running Marlin, it doesn’t look like light burn currently supports this. Any chance you’d be willing to tie air assist to M8 and M9 for flood coolant, or better yet have a way to let the user type in their own M/#/G# number for air on and air off?

M8 - Turn flood coolant ON.
M9 - Turn coolant OFF.

I can set it up to use M8 / M9. I wasn’t sure what the appropriate commands were for Marlin, so I left them out. M8 / M9 is used by GRBL and Smoothiware, so it’s easy for me to enable it in the Marlin profile.

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