Transmission

Here is a python script I wrote that almost does this: https://gist.github.com/jezuk/4534414

The files are prioritised in alphabetical order, which works for me on most torrents. Any files marked do not download will be ignored. Instructions are in the comments at the top.

Let me know if you need ...

There is a script posted by Alpo on this thread which does something like this.

I've modded that script to only change the priority of files from normal to high rather than sequentially downloading. You can get my version from here. It also supports authenticated rpc using a .netrc file.

This way ...