Would it be possible to include a trigger port, or reassign one of the pins, so that external hardware could be triggered when an audio event with pre-defined characteristics occurs? A simple version of this could trigger only when recording begins (perhaps a minor modification of the recording LED hardware). A more complex version, which would need software modifications, could include a pre-configued delay, number of trigger activations, and duration. Such a feature could be used, for example, to trigger a camera to capture a photo or video clip that would show the context of the audio recording.
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We done this on a couple of projects - triggering an external accelerometer tag when the AudioMoth is recording and recording when triggered by an external IR sensor. It's very easy to address by modifying the firmware slightly - generally just a few lines to activate the GPIO pin as required.