As an aside, it is technically possible to disable uploading/sharing when using torrents though it is generally frowned upon.

Disabling uploading on a torrent application makes no difference. The moment you add a torrent to your client and start it, you connect to the swarm, and copyright trolls send letters to the ISPs of every IP they find on the swarm, so it doesn't matter if you were or weren't uploading at the time that they detected your IP.

Not to mention that some trackers and torrent clients ban or refuse to connect to clients that don't upload.