"Static" Watchlists or Movie Playlists

as stated in the previous replies – this is already pretty much covered
(a) you can have a (smart) collection and publish it to the home page or a library’s recommended tab – this is already possible using a variety of criteria such as ratings, custom labels…
(b) there’s an existing suggestion discussing an option to keep watched items visible in the watchlist

In addition…
(c) there’s also an existing suggestion discussing the option to have a “favorite list”

I suggest you test the option pointed out by pshanew (=a) or comment/vote in those existing suggestions (=b/c). The latter will help us avoid distracting or cannibalizing votes if different suggestions cover the same scope.

Unless we’ve missed some unique aspect of your suggestion, I suggest we close this thread in favor of the two existing suggestion threads.