Hope this is the right place to ask for this lua feature request.
There doesn't seem to be any audio functions in the lua API (https://davidmilligan.github.io/ml-lua/).
I'm mostly interested in running AUDIO_REMOTE_SHOT in lua to trigger either a full shutter press or short and long shutter half-press on an EOSM. The EOSM doesn't have the option of using a wired remote so shutter events have to be done either through the IR remote or the mic input. The lua script should be able to start a process (like a shutter half-press or rack focus or whatever) from an audio cue.
Another advantage of having lua do the shutter half-press is that it resets the power savings timer while AUDIO_REMOTE_SHOT doesn't reset the timer. At least that's the experience with a film scanner project that one user is trying to set up with an EOSM.
http://www.magiclantern.fm/forum/index.php?topic=19005.0