Dynamically (automatically) change the “download folder” in Safari

Saft — the (now seemingly defunct as of Safari 5.1) Safari plugin — had the ability to change the name of the download folder (and create said folder if it didn't already exist) that Safari uses (e.g., by creating a name based on the date). This was incredibly useful for decluttering/ordering my downloads.

Is there any comparable feature in a supported Safari extension (for Safari 5.1)?

P.S. I know I can create a cron job to do this after the fact, but that seems kludgey and prone to errors because of file timestamps, automatically unpacked ZIP/tar/cpio files, etc.