Something I've noticed quite a few bittorrent clients lack is the ability to effectively cross seed. It's worth supporting this due to lots of duplication across private trackers. The general approach for allowing this should be deduplicating torrents by both infohash AND announce(maybe url list too).
Some couriers augment files so they land differently. However, now that XFS has reflink like BTRFS, taking advantage of this in the client would be fantastic.
Something I've noticed quite a few bittorrent clients lack is the ability to effectively cross seed. It's worth supporting this due to lots of duplication across private trackers. The general approach for allowing this should be deduplicating torrents by both infohash AND announce(maybe url list too).