You can [stack videos], but there's one rather obvious use-case it won't handle—stacking multi-part movies (e.g., a movie broken into two or more files). Such files can be stacked in Standard View and there is a Play stack function, but that doesn't carry-over into Theatre View. If they're stacked, only the top appears—as expected—but then there's no way to play subsequent parts.
There's lot's of use-cases for stacking videos. I don't think there's any compelling need for special treatment of stacked videos in Theatre View. All that's needed is for the
Play stack function that already exists in Standard View to have an equivalent in Theatre View. We probably don't even need that. It would be sufficient if
Play would simple play all the members of a stack. It would then be possible to stack something before or after a movie (for example), and then just skip it if not interested. Users can decide for themselves whether such an item should be stacked, or kept separate so it can be selected alone or so information about it can be recorded. If one did adopt a practice of stacking "extras," however, it might make sense to maintain and display a custom memo field where information about those extras is recorded.
Here's another use-case: I've collected trailers for most of my movies. In
Personal Video Database, they're simply recorded in the same path field of a movie record as the movie. If I were to use PVD's play command, it would play the trailer followed by the movie. I would have been perfectly happy to do the same thing in MC—by stacking them. Yes, play would always start with a trailer, but that could be skipped with one button press. On the other hand, it would have saved a lot of trouble by eliminating the need to maintain separate records and views to handle the trailers. I've good some cool trailer views, but they're not very practical unless I happen to be in mood to view a bunch of trailers. It's a PITA to select a movie based on it's trailer, then have to navigate to movie view to find and watch the movie.
BTW, this went nowhere when I pleaded for it in September 2009. Maybe with both of us pushing it, they'll do it just to shut us up.