Exactly this, I thought "torrents in the browser in a js app? Sounds good!" , but itlooks like its a clunky web interface (that you need to install) for a headless torrent client (that you need to install).

As far as I know you need a client running (torque, or µTorrent (+ a browser extension?)) and then you can interact with it using btapp.js

Last time I checked there was no torque support for Linux (yet).

I do agree, they are terrible at explaining what they have.