I was looking for a more recent version of qbittorrent in wheezy so I decided to make a backport from jessie (3.1.10). Although it might build with the wheezy version of libtorrent-rasterbar (0.15.10), I found that qbittorent is more stable with a more recent one, so I started with the backport of libtorrent-rasterbar 0.16.18. No changes were required, I just updated the changelog and rebuilt with pbuilder.
So I'm kindly asking anyone interested for review and upload to backports. Once it gets to the archive, I have the qbittorrent backport ready to be submitted.