@TeamYouTube
It would be helpful if you enabled comments on private and unlisted videos.
That way, when I know I want to make a pinned comment, I can do it in advance and not have the first few dozen people that watch miss it.
Make sure the right team sees your comments! Use our Send Feedback tool to submit the suggestion, here's how: https://goo.gl/WdI0BK . You may not get a response, but we do review all of the feedback and use it to prioritize requests.