>click-and-hold on any "eyeball" in a post could bring up the option 

Nothing happens except collapsing that comment (and it's subcomments). I want to collapse all the high level comments and their sub comments at the same time.

Good idea.
Maybe click-and-hold on any "eyeball" in a post could bring up the option for this.

OneOneSeven

Is there a way to collapse all the comments on a post?

I do this manually after I read the whole post. I want to be able to efficiently read new comments when I see the blue rectangle on the post.

Stacker Saloon

saloon

Is there a way to collapse all the comments on a post? 

I do this manually after I read the whole post. I want to be able to efficiently read new comments when I see the blue rectangle on the post.