It would be very comfortable if tap on the fingerprint sensor act as back button. It was there in my previous phone and it was very convenient. I really miss that.For a 6.4 inch phone it's really hard to hit back button at the lower corner.
Not a bad idea, I also struggle with the back button location without enabling gestures sometimes. I'll forward this to the developers!
Could a long press action be added too? Like long press on the fingerprint for the recent apps screen or long press to launch an app or some other action?
Or a camera shutter
Yes a camera shutter will be very much helpful
It's much better to use a timer than pressing a button.