add the ability to receive an email notification one minute after a missed chat
Sometimes we have chat operators who are not logged in but are working at our company. If they receive an email about a missed chat (or unanswered chat) after one minute a user has sent a chat message, they would be able to log in and still answer it.

Hi!
Unfortunately it won’t be possible technically.
You can use our mobile apps (for Android and iOS) to receive push-notification and if necessary reply via app.
Please note that alive mobile session will keep widget always in Online state: agent need to either change status in mobile app to Invisible, either log out or end mobile session from web-dashboard (Profile > Browser & App sessions)