It would be nice to have the amount of time seeded listed on individual torrents. That way, when I run low on bandwidth, I know which ones to cut.
Also, it would be nice to automatically stop torrents after they've been seeded for a certain time. For example, Ubuntu releases always occur at scheduled times. When there's a new release, the old release doesn't need as many seeders, so it would be nice to automatically drop that torrent so that bandwidth can be given to newer releases, or other torrents.