hiding subthreads rooted on comments that are -3 or lower from recent and top comments.

I endorse this, incidentally. (Not that there's any particular reason for anyone to care, but I've expressed my opposition to various other suggestions, so it seems only fair to express my endorsement as well.)

I also share the belief that automatic actions are more likely to apply in situations their coders would not endorse. That said, I also endorse the desire to reduce the workload on administrators. (And I appreciate the desire to diffuse social pressure on those administrators to avoid or reverse the action, though I'm more conflicted about whether I endorse that.)