Why not use transmission headless with the web interface? ( Ok, Transmission's web interface is a bit shit and you have to use the command line for some options.)
There's nothing wrong with using Transmission. I find the new web UI rather nice, but IMHO, still not be ideal for newcomers. With PikaTorrent, my goal is to provide a simple, cross-platform client that can be controlled remotely without requiring any technical knowledge.
It's tough because this kind of person probably doesn't exist in any significant quantity.
Have you tried new v4 web interface?
Doesn't like like v4 is in the Raspberry Pi repo. I'll try it as soon as it shows up.