>I like the new way to add a comment to items in either of these lists - it is much more intuitive.
>
>But how would I go about editing a comment that I might have added?... I am a terrible typist and I often have to go back a few times to make nice cleanups.

Under Site News, I mentioned some of those.

Basically, in order to preserve the same integrity as the messages area, the same validation happens. If no more reply has been done after yours, you'll be in edit mode by default on that last one. So, you can just update it. But, if one already replied, it become locked.