Question Two Questions about Moto G - Phone dialer & Camerra app

1) for the camera app, is any way to get it to focus by tapping a place instead of dragging the crosshair icon?

2) for the Phone dialer, how do i make it so the dialer shows up automatically everytime i launch the phone app? i don't have launching the phone app and having to press an extra button to get the dialer to show up.

Also how do i delete all my contacts on the phone? i don't see an option for that.