Option to have temporarily allow replies from lock screen.
You only want your messages hidden when others are around. If you know you're gonna be alone for a while it would be nice to have the option to allow reading the messages and replying for a set time. Sort of like a reverse incognito mode
Perhaps in the app, there can be an icon you touch/hold to bring up a slider with different amounts of time (30, 60 min., etc.). While still holding your finger down you can drag down to the time you'd like to be able to read or reply quickly from the home screen.
Would be nice if you're busy and don't wanna unlock your phone for the whole process just to find out it's a not too important reminder or group message. You'll see an important message, reply if you need to and your messages will automatically go back to being unreadable at your set time without going through all the privacy settings again.