headless torrent with grouping feature

I have to admit, I was spoiled by KDE's ktorrent with their grouping feature and all that. It took me a while to realize it's not exactly a standart feature. For example, transmission doesn't have it.

Now, I'm trying to build a headless file server amd move my torrenting activities there. For this one, I'd rather not have a full blown KDE software suite.

Ultimately, I'd like to ask: is there a headless torrent client (such as rtorrent and qbittorrent-nox) that has grouping feature?