This is why I would not do anything that deviate from service and safety protocol on the plane as passengers are watching every move we make.

To your concern, there is no power outlet anywhere else but at your seat on the 763. The double power outlets be the doors are mainly for the vacuum cleaner and not suitable for small devices. It could pose a fire hazard if cell phone is being charged there even though there is no report of it yet.

There were few time I asked to use the power outlet to charge other passengers device from coach on the 747. However, not anymore as to liability issue as we are responsible to their devices if we take it from them.