Fingerprint sensor gesture as back button

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.
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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.