Maybe you could have an ongoing vote thread. Link a video in each post, lock it down to keep it clean so only you can add posts. Explain in the first post that whenever a video reaches some arbitrary number of likes (100 or whatever), it goes on the Playlist. Good way for creators to get some views, crowdsources the ranking, not being included right away doesn’t mean not being included ever, opportunity for creators to see the differences between their videos and popular videos, bunch of wins if I’m not missing something.
Maybe you’d need a submission thread as well if you didn’t want to take submissions via email or pm. Or maybe you could leave the vote thread open, we submit the video with no comments (the video should ideally be self-supporting for new users) and rely on higher-level forum members to clean up posts that don’t follow the rules?
Or maybe there’s a better way all around, i don’t know.