Ask PG: Live comment updates for endorsers

I'd like to do my part to endorse quality comments, however I have a short attention span. The time I spend reading a comment thread is probably the only time I'll ever spend on that thread. If a comment has been made just before I got there I will have a chance to endorse it, however the whole time I'm reading a thread is time when I'm engaged and available to endorse.

If there were an indication somewhere that there were N new comments in the thread I'm reading, or if they just showed up my time would be used more productively for the community.