Well, if someone went through the trouble of adding the support for "smart synonyms" to the search why not then just use all this wonderful, portable Perl(the only kind vroom writes :) to then take the step further and do the check as one's posting in SOPW? It strikes me that getting the 'synonym' stuff right would be the hard part and parsing through the text of a new entry to stip out junk (non-keyword prepositions, proper nouns, monk names, etc.) would be the easy(ier) part.
I'd also like to add that the way to display this info might be something like a sliding scale of matching. (this is oddly enough inspired by the 'what to expect' seiries of books that all parents in the monastery should be all too familiar with). The strongest matches could be listed as 'most possible', followed by 'probably relevant', 'possibly relevant' and 'shot in the dark'. And, if we're to consider Considering Super Search, maybe we could allow people to choose only strong matches, etc. etc. I would think that posts for SOPW would actually be parsed for the weakest matches, though.
"sometimes when you make a request for the head you don't
want the big, fat body...don't you go snickering."
-- Nathan Torkington UoP2K a.k.a gnat