Since I'm in the mood to upgrade, I figured I might as well do so for Transmission. More specifically, I want to upgrade so that I can get more fine grain control over the files to download in a torrent; You can do this via the CLI or a third party GUI client like this only. i.e. You cannot access this feature using the web interface (yet). Other things that have changed moving from v1.2 to the current v1.42 include the following:
Notably, the working directory is now /mnt/HD_a2/.transmission-daemon instead of just /mnt/HD_a2/.transmission. (since v1.3) If you are upgrading, you will need to move your existing directory manually if you want to resume your existing downloads. You may also need to amend your custom addon scripts (if any) such as my enhanced transmission script.
Another change (also since v1.3) is that Clutch no longer depends on a separate web server as one is already built in. This sucks as you now have another web server running on the box listening on its own port (default is 9091). Having said that, it does make installation and maintenance easier.
Lastly, access to Transmission is now restricted to local host by default (doesn't matter if you are using the CLI or web interface) (this change was introduced in v1.42). To allow access from other hosts, you will need to edit the rpc-whitelist parameter in the settings.json configuration file.
For an (almost) idiot-proof guide on setting up Trasmission v1.42 on the DNS-323, check out this guide by andy. More info can also be found in this forum thread.