The ability to import Labels, (active) torrents and their download locations from µTorrent to qBittorrent.
How should it potentially work?
qBittorrent should look into µtorrents appdata folder (if it exists) for the settings.dat file and resume.dat file.
From those it could (hopefully) distillate the used Labels, which torrents are actively downloaded/seeded within µTorrent AND most of all WHERE they are located.
(and maybe a few more µTorrent settings that qBittorrent could use

By checking these files first before simply adding every .torrent file withing µTorrents appdata folder will save a lot of hassle with old and long dead .torrent files.
(of the 770+ .torrent files in this folder on my HDD, only a mere 200 would still be alive)