Transmission

Looks like someone has had this idea before: http://www.ether.net.au/~robin/bittorre ... nf_ext.rtf
I wonder if anyone uses it?

I'm designing a bittorrent assist application - a small app that runs as if it were a standard peer on the same machine and provides pieces from alternative sources. Is there some way (preferably a cross-torrent app method, but especially for transmission) of a peer announcing itself and that it ...