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Can I mix tags and categories?

As of version 1.3 the plugin allows for similarity to be calculated on a combination of tags and plugins using the sim_by_mix(); command. You can set the way the lists are combined using the relaive mixing weights. You can also use the sim_by_tag(); and sim_by_cat(); commands together to generate different lists of related posts.

Why does my list include matches weaker than the match strength I chose?

If you use the 'Show one more random related post' option the last item in the list is random and does not consider the standard minimum strength limitations. You can set a separate minimum strength level for the random post.