Not sure how you established that HTTP LB works.
It does not automatically work for me. Instead I have to start 1 download segment and after a few seconds add 1 more, than in 90% cases 2nd DL will be load balanced.
Haven’t tried FTP in years, so don’t know if that works.
How specifically those rules can be configured?
Can you provide step by step instructions?
What I am presently doing is using for example DownThemAll add-on for Firefox. It is configured to start only 1 segment. Speed reaches 1xDSL. Then after a few seconds I add another segment and d/l rate reaches 2xDSL line. Most of the time that works, but it’s a manual workaround every time.