If you download something off Direct (using the search, not tested with multiplayer or replays), then start another download, they should form a queue and download 2 at a time. This isn't happening, as when you add a second map to the queue it just changes to green and gets the [Downloading] tag, but doesn't even get to the queue. Also, trying to make the same map download again will create multiple instances of the [Downloading] tag.
Will edit this with a screenshot when I wake up.
Will edit this with a screenshot when I wake up.