I've never used OpenWrt, it is possible to download with Amule and Transmission on a external hard disk? There's a guide? Thanks
box has transmission built in, connect in a browser to the box ip for the interface. there you will find the torrrent settings
aria2 is a lightweight multi-protocol & multi-source command-line download utility. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink