All said in the title.
By adding more URLs to the same file as mirrors can increase the download rate.
Since you already added an URL updating feature, adding more might be very good.

One extremely important thing to add is to be able to choose the number of connections per download individually, or per type of download like torrent file or direct download file. I also though about simply adding in the new download window a "Static" number of connections or "Dynami...