thanks for making this! I'd love to use the microphone key (fn + mic) to trigger Handy but even after turning off dictation it doesn't seem like the system allows that key to be used (I get a dialog prompting me to turn on dictation).

hey! these kinds of keyboard related things are well solved by Karabiner elements:

https://karabiner-elements.pqrs.org/

There you can map (whatever key) to (whatever other key). E.g. I have right command mapped to F20, available to all other apps .

No problem! Thank you for trying it and requesting features!

I added a issue (and comment) for this on the GitHub repo: https://github.com/cjpais/Handy/issues/47