BitTyrant is an experimental version to determine if a tit-for-tat type of bandwidth allocation will be better for the user and/or swarm. What it basically does is attempt to allocate more upload bandwidth to clients that have given it higher download bandwidth. As for 1.7 beta - had a strange issue. I only received 1 node, after about 10 minutes, in DHT when I usually get about 200+. I right clicked and disabled DHT, right clicked again to enable DHT, and it did the (Login) and numbers starting going up. Another application start I had no DHT issue.