HTC provides options that allow for faster photo capture than a physical camera button. Sightseeing mode, combined with Touch to Capture mode, allows you to use your entire screen is as a shutter button enabling you to take shots from difficult angles. For example, taking a self portrait with a physical shutter button would move the device around resulting in blurred images. With Touch to Capture and Countdown timer, you can easily take great self portraits.
Note: Touch to Capture may be turned on or off in the Camera settings.