Filtering would be a much more effective way than simply adding another column exclusively for movies. If we can filter several options at once, similar to the 'Sort' feature in Excel spreadsheets, it would work even better.
For example, we should be able to filter, at the very least:
Dramas
Movies
Countries: Japan, Korea, China, Taiwan, Thailand
Genre: Horror, Romance, Action, Mystery, Drama, Comedy etc
So if we want to watch a horror movie from Japan, we should be able to click or tick these criteria and have our list filter out everything else that doesn't meet these specifications. Then if we want a particular year and a particular rating we can do this by clicking the little downward pointing arrow button that's currently on our drama list (At the moment, it's the only filter option we have available to us and you can't filter more than one option at a time, which is a bit inconvenient).
Someone else have already recommended better filtering options on our drama lists so hopefully the mods will see that this is a popular request even though each individual suggestion hasn't received that many votes (compared to others).