Well after you started this thread I was curious about RSS. By the time I got around to installing software this thread had dissapeared on me and I couldn't find it. (Can't search for "RSS" on this forum and the only other related words I could think of were "download" and "anime", those wont work either
).
What are you using to auto-download? I only found one app that claimed to auto-download (had anime in the name) but it wasn't very good and I didn't see how to get it to download stuff.
After looking into RSS, and even writing my own feed for manga, it's very simple. It would be easy to write a script in linux that would monitor feeds for certain titles and launch a linux bittorrent client. It would be harder to accomplish in Windows, though, but there are open source bittorrent apps and RSS readers for Windows. It could be done.