I think He means that he wants to implement Fair Sharing
So if Tom seed 100mb then Tom can download only 100mb
and if Harry seed 500mb and he try to download 600mb file then the torrent must not download fully, it must download only 500mb and wait for Harry to seed more.
And the 2nd question..
I think He mean can this rule be applied Per Individual torrent
So if Tom is Downloading "Islam-The-True-Religion-FullVideo.torrent" and the torrent is 700mb then he must seed 700mb of the same torrent
Thats how i understand him...........maybe he mean something else....God Knows Best