I think this issue has been mentioned before, but I'd like to push for this to be availible. Recently a blog that I have commented on has had an alarmingly large amount of long comments due to a discussion, which is clogging up my "My Comments" page. It always jumps to the top, and I have to scroll forever to get to the bottom of it.
I've noticed that the page automatically collapses comments in the middle, but I'd like the option to be able to personally collapse comments. Any other views on the matter?