Thanks for the feedback!
The thing is it is very easy to add that feature, but the problem is that in the chat box when you press z, it will make it unusable as it will keep altering the mic status.
I choose right alt as it is one of the least used button.
Do tell if you have any other suggestions, thanks again :)

EDIT : Can you please specific the device that you are using? because I haven't encountered the issue of MENU popping up when alt is pressed. It will be really helpful.