So I'm a little unsure, but it seems the only way to do this is to compile from source?
If you do an apt-cache search I only see listed:
No "transmission-daemon" which would appear from my reading on your site to be the crucial thing actually needed.transmission-cli - free, lightweight BitTorrent client (command line interface)
transmission-common - free, lightweight BitTorrent client
transmission-gtk - free, lightweight BitTorrent client (graphical interface)
transmission - free, lightweight BitTorrent client
Any clues/tips?