Tap Tap on an iPhone 6/6+ Touch ID pad activates Reachability. Whether people like the feature or not, the fact that it uses the Touch ID pad to do something other than fingerprint scan is promising. But can the Touch ID pad be implemented with more gestures? Personally, I'm thinking that a swipe left on the Touch ID pad could act like a "Back" button (like in Android) or function like a blackberry trackball Would be interesting. Any ideas?