Hey @TeamYouTube - a great feature would be something where you could set a threshold of watchtime on a video before someone could comment. Like: Someone can only comment if they watch *at least* 25% 50% or 100% of the video. Thanks, You're Welcome.
Or just have the font color of their comment be adjusted based on time spent watching. Watched the entire video? Black font/white background. Watched 10 seconds? White font/white background...and so forth. The % of the video watched = % of contrast of font/background.
Prowl.