@GaryL. Quality reply from a quality intellect. Thanks Gary, lovely talking with you. Best wishes to the kids and good luck with your contrarian trolling career. I hope it brings you all the happiness you deserve.
Well, it doesn’t look like implementing this is a priority for NowTV.
But as in the Solution above, you can replace your NowTV Sticks(s) with Roku Sticks, which allow such locking, right now.