Dusk, other point than bandwidth pulls me off is that my computer being searched at all.
As far as i know , it only searches within a specific directory.
aka your download folder.
(I might be wrong)
So you dont want it something to be accessed , dont put it that directory .
I run the torrent downloader on a "download PC" anyway because i know that virusses and spyware is common ground with file sharing. So there is nothing of real importance on the PC so if all goes pear-shaped , i format and reload.
Access to the rest of the PC`s on the network are also password protected and each PC has a different username and password.