We'd like to see a chat head overlay similar to that seen on Facebook's Messenger app. I love the ability to quick respond and pull down the drawer to do so, but having it on screen is a neat aesthetic that I think many users would enjoy.
Facebook currently offers sending SMS from their messenger chat heads, but its not nearly as intuitive or customizable as Textra. No chat head SMS app currently runs smoothly, and they dont offer anything remotely close to Textras options. I believe it would be wise to tackle this feature before everyone else is running it.
I love Textra, it has to be the cleanest most versatile SMS on the market, and I think this feature would really help it maintain that spot on top.