We have also been in a similar cabin on the Regal. It was not a suite, however, the balcony was HUGE as well.
We NEVER were required or asked to lock our balcony door. The only requirement is that you close the drapes at night so your lights do not interfere with the bridge. Turn off your lights if you want to enjoy your balcony at night.
For short people, the only negative is that you can't enjoy the view when sitting down.
Another CC member, suggested that she stacks the chairs and sits on them to see the view.