Currently I can only add videos to my watchlist. It would be nice to add channels to the watchlist eg. "Company News" channel. With this function I have the most important news in my watchlist for quick access.
As a highlight: If I opened my watchlist, I would like to see a small number with the number of changes on a channel, such as a 2 for 2 new videos. I could then take a closer look at these.