As so many people, I came here when YouTube decided that I only needed to see two thumbnails at a time(!!!), so this was a lifesaver!

I didn't find a 'suggestion box,' but here are two pieces of feedback I sent YouTube and they completely ignored: It would be nice to have a button to play the previous video on a playlist! Sometimes creators put the most recent videos first on a playlist that has a chronological order and we have to manually select the next video, it sucks. Also, title translations SHOULD BE OPTIONAL! I want to see the original title, not a bad translation (since there's a setting to force the original audio track, would it be possible to do this?)