Group different websites to the same exit node
Sometimes sites require user to use the same IP between domains. A good example is youtube.com that is streaming from googlevodeo.com and sometimes (for live streams) it passes IP to the googlevideo.com and terminate connection if the stream request IP differ from the IP used to load youtube. There should be an option to group websites to the same exit node. The exit node can be changed periodically but should always be the same for both (or more) addresses.