I don't believe that a separate comment pool will make that happen. In fact, I think that blind bot autovoting on comments would increase with a separate pool a lot. If there are two pools that you either compete in or abstain from, anyone wishing to compete and doesn't want to read comments will automate it for the curation rewards.

I believe comment curation (and their resulting order) is an important thing to keep human focused, moreso than post curation (which results in trending order).