2. Yes, sort of. Touch anywhere on the screen to force the focus point; tap the large virtual button near the bottom of the screen to activate the shutter:
Camera Zoom FX does both touch anywhere to shoot and voice activated shutter. I have had it on my phone for a couple of years, but rarely use it so I can't speak specifically to other issues such as photo quality, etc.
All in all, though, it offers lots of cool options - definitely worth taking a look at.