I too would find this useful, though a history of previously used download directories would be more helpful for me personally.
Categories (say five or so different choices) aren't really that helpful in the way I use Alt.Binz because 95% of what I get would fit under either TV or Movie (unless you had the ability to create your own categories, and five might not be enough)
A historical list would work for me, since I have directories on various volumes, which I use all the time, but how much history, 5, 10, 20, 100?
I agree having to navigate to a selected folder each time is time consuming, which is why I thought historical choices might be helpful, not just the last folder - I'd have at least 10-20 I'd use regularly - at the moment, everything gets copied manually from one big download folder into various sub folders on various volumes.
Just a thought.