Semi sequential downloading is quite useful option. If you download video is some archive with images you absolutely need beginning of the file and preferably end too if video is missing few chunks that does not matter much, It will still play fine with few interruptions. and you may be able to partially extract or repair archive too. this also does some good in the end of the torrent life cycle, since torrent will be stuck on 98% with no seeds. If that is some movie , it will play quite fine and lechers hoping for seed to appear will be staying online almost forever acting as semi seeds. if torrent is well balanced it is more likely that it will be stuck on some random 20-80% becoming completely useless
