[Milhouse]

Well just try it out here is the addon https://www.dropbox.com/sh/ldk2rhxxwofrb...ion.tar.gz install it from xbmc. you can ssh into the pi and the settings.json file is under .cache/transmission i think u can use transmission.start/stop in the command line or enable disable the addon under services in xbmc addons services. i have the addon disabled in xbmc and then start it using the command line whenever i need it. only the web based server is available and there is a watch folder also by default

there is also an addon for the SABnzbd-Suite

For the cost involved, I'd personally run Transmission (plus Sickbeard/SABnzbd and other network services related stuff) on a second dedicated and headless "server" Raspberry Pi 512MB. And as it would be running Raspbian, installing services is much less of a headache - no need for custom and possibly out of date add-ons. You could even install MySQL and have it become your central repository for XBMC metadata.

The last thing I'd want is my media player experience being impaired by background processes stealing cycles and memory...anyone seeding a few hundred torrents could find their USB/network interface is too busy to actually stream media content!