yeh my test was slow as well. AS3 do the tracking side for us (add ?torrent to end of file) but the other issue that i have overlooked is the recieving box needs to have a client. Looking through vagrant docs to see if they have integregated a client but so far no joy.
http://aws.amazon.com/s3/faqs/#What_is_the_BitTorrent_TM_protocol_and_how_do_I_use_it_with_Amazon_S3

think this leaves the torrent option for the dev team to decide on rather than be integrated into pressupbox? If they do use torrent, then once their clients put the box in the right folder all should be ok.