Transmission

I think we should be able to mass change the announce URL of our torrents in one fell swoop just like you can on PC bittorrent trackers. I need to change 1000 torrents' announce URLs but I can't do that on any Mac bittorrent client without going in manually changing it one by one.

How do I go about seeding my torrents from external hard drive with Transmission? Everything is already backed up on the external. I'd like to clear 500 gigs off of my desktop hard drive and just seed off of the external from now on.

Is this feature available in any of the newer versions of Transmission for mac? I need to mass change the announce URL for my torrents. I have like 1000+ so doing that manually would be a chore.