If you need more effect than that, the only thing you can do is tweak the scores of existing rules, or write some custom ones. SA doesn't really keep a database of messages, it's just got a series of text search rules.
I've got a pretty reasonable guide on custom rule writing. It's a slightly advanced topic, but if you want to go that route, it should get you started.
http://mywebpages.comcast.net/mkettler/sa/SA-rules-howto.txt
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