Torrents created with compute_torrent will be automatically tracked unless tracker is disabled (set BT-tracker_port to 0 and restart core). Currently (3.0.1+cvs) the directory torrents/tracked is not used. compute_torrent will output the local path to generated torrent file and also the url for convenient download (served by the tracker so it must be enabled for this to work, probably better serve with core itself?). Mind, that newly generated torrent will be seeded only if it's contents is located in incoming directory.
Command torrents will list all torrent files the core knows of.