This is great stuff. One question -- what about applying the role of the word of the sentence into the weighting, along with the frequency. As in general Subjec

This is great stuff. One question -- what about applying the role of the word of the sentence into the weighting, along with the frequency. As in general Subject, Verb and DOs are going to be MUCH more important than, say, adverbs and articles. Is that not done because it's harder to automate vs. just frequency?