#3... I think I saw a post stating that there will be a VIEWED MOVIE (Icon)? That would definitely help in the future.... and we can actually filter out the ones that we've watched.
It's already possible to filter the movies that you've watched. If you've seen a movie, you show it by rating it. You can't rate a movie without having seen it, so if a movie is rated it means that you've seen it. The rating reminds you that you've watched the movie and also how much you've liked it.
If you look at the rating filter, there's even a value "not rated (not yet seen)" to list only the movies that you haven't watched.
When you look at a person's filmography, you can click the checkbox "rated" to list only the movies that you've watched.
When you make a string search, you can click the checkbox "rated" to discard the movies that you haven't watched.
Inside the grids, whether there's a smiley or not tells you if you've seen a movie or not.
P.S: I think that the post you've read was about an icon that would give details about your viewing experience (where, when, how many times).http://www.coollector.com/viewtopic.php?f=1&t=1557&p=15718&hilit=icon#p15718