I think its a good idea if new version updates the torrent list in the left pane of the torrent client.
Remove the sites that go offline like btjunkie
Update url links to working torrent sites.
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Nicve idea but impractical. Unfortunately sites come and go (usually when they get hit by a lawyer waving ‘cease and desist’ orders or by a court ordering an ISP to block them) . Any updating would have to be almost non-stop (and eat up a lot of bandwidth)