[predakanga]

There are many types of private tracker that would love to see this - for instance consider gaming trackers, where you may have a single .torrent for a large collection of ROMs, or DLC for a game. Consider TV trackers, tracking a whole TV season with a single .torrent file, or music trackers with discographies.

More importantly, a key concern on private trackers is swarm size - an extension like this would have the potential to expand the available peers on a given file, if the file exists in other swarms on the same tracker. Not a very common use case, but one to consider nonetheless.