Combine "MAC save as prompt" and labels.
Combine "MAC save as prompt" and labels - torrent added = prompt for label which has predefined destination folder. Ex. choose label "Movie" and uTorrent will save it to pre-chosen destination for "Movies". This should only be an option, not forced.
Tim Kilåker commented
You could also evolve this idea to work together with smart feeds. Please add this grouping function with predefined destination folder. It could also work as moving torrents labeled "X" to destination "Y" after download is complete and have the incomplete files stored at some temp. folder meantime.