2 old features I liked from the reddit version. Probably going to be quite low priority versus some other things, but they're the missing things I'm noticing most.
The little "next / previous comment" arrows. Worked very well for skipping comment chains when you're already a bit into them.
The little "+#" count next to the total comments to show how many new comments have popped up in a post. Combined with the unread comment dot it made keeping track of new comments on a thread I liked nice.