Brake by wire is still very new since braking is such a safety related control, nobody can guarantee the reliability. No brakes at 100km/h+ (or any speed) ain't exactly safe!!! It would be very hard to instill enough confidence into motorists that it is a reliable, safe technology. It would destroy toe-tip feeling and control in performance driving too. Feeling the brake fade, bite and the like.
Throttle by wire was introduced as it doesn't have such safety concerns, but it's main advantage is it is one less physical path that vibrations from the engine can travel into the cabin unlike on a cable, thus improving NVH (Noise vibration Harshness) which is the eternal quest for a quieter more pleasant cabin.
The fuel door is locked then the doors are locked via an interanl electronic solenoid. When you unlock the doors, the petrol flap unlocks also.
The sedan interestingly has a bigger boot that a BA/BF Falcon which is pretty cool. Sedans always have a bigger boot than their equivalent hatch.
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2012 Mazda3 MPS 
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