What I really would like to have would be to collapse comment threads via a column that runs the length of the comment thread and is indented like its respective comment. This way I don't have to scroll to find the comment to collapse its thread, and clicking the column is easier. This is used in some subreddits in the old Reddit style, e.g. /r/de as can be seen here: https://old.reddit.com/r/de/comments/rcc9us/exper…
One I came across performs automatic voting. On pageload, it scans for comments starting with "So..." or ending with " lol" and downvotes them. I'm not sure who this is for. "Communication peeves" comes to mind, but doesn't quite fit. I'm don't know what the word is for this.