Just track a bunch of boards (see my OPML file) that your favorite posters post on.
Then set up your smartfeeds AS THE POSTER'S ALIAS (i.e. MOMO, Monk, jimmybob, etc., etc., etc...). In other words, you are searching for the poster's alias...which is perfect because the iHub RSS feeds begin every post with the user's alias.
That'll do the trick!
Or you could just follow me. LOL!!!!!! :-D