It could be nice to have a popup menu where you can choose from the main reasons why a comment can be downvoted according to the rules, pointing to the relative

It could be nice to have a popup menu where you can choose from the main reasons why a comment can be downvoted according to the rules, pointing to the relative FAQ entry. "Ad hominem" "Off topic" "Spammy" - this would help the newcomers and would probably be used more than having to type a reason.