Sometimes I don't know how to thank a comment with good information. It's sad. I hope they do something about it.
You can post another comment to the torrent, perhaps starting with the commenter's name. The previous commenter will get a message saying that there's a new comment on that torrent, and he can then go back to the torrent page and read it.
As far as I know, there isn't a way to give seed points to another user unless they post a torrent and you give seed points to that torrent.
If memory serves, there have been earlier attempts to get the owner to broaden the ability to "trade" seedpoints (SBP) - but they have been rebuffed on several grounds.
I don't recall all of them, but the general point was that the more you allowed the "exchange" of SBP, the more open to abuse you made the whole system... a system that is designed to reward SEEDING TORRENTS, not just general good behavior.
In this case, I think a simple "Thank You" will need to suffice!