Apologies if this is a duplicate thread; if another one exists, I forgot about/couldn't find it.
It would be cool to see emulators given the support to load an archive (or a folder) full of movie files, and have them function like a playlist. There could be hotkeys to cycle through the movies or to loop them.
I can see this having two big advantages. The first is the ability to create blooper reels which could show the evolution of a trick, or showcase the different ways to complete a part of a game, or just for entertainment.
The second reason would be as a better sort of documentation of game tricks. I have always thought that this site's wiki could use actual movie clips demonstrating tricks, instead of just wiki text, so that a potential TASer wanting to learn a trick could see it in action to analyze it frame-by-frame. Having an archive full of small replay files would be much more convenient than having to search for the trick in a published TAS (especially one that was obsoleted, as old tricks could unexpectedly become useful again), or worse, a trick that was never used in a published TAS but may be useful in the future. Furthermore, the trick demos could make use of subtitles, and also demonstrate the trick very slowly and methodically for comprehension, compared to seeing them happen at lighting speed in a published run.
I'm not a good programmer, but it doesn't seem like it would be a difficult feature to add, especially if the movie files aren't loaded into memory and the playlist just acts as a browser.