Here are two new keyboard shortcuts you can use when you're on inbox:
  1. Hit 
    H
     from any thread to follow-up on it or adjust your follow-up time
  2. Hit the 🔼 🔽  keys on Inbox to select a thread and act on it. Try hitting 
    H
     to quickly update the follow-up option without even going to the thread.
Screen Shot 2021-10-20 at 8