I have seen 3 other requests for this, 2 as product features, 1 as a bug, clearly this is something that users need. Not having the ability to edit combined with not being able to default the input trigger to "press the button’ instead of ‘send on enter’ , means that I am regularly having to delete and re-write my comments.
Being able to edit a comment is a desperately needed feature, i have no problem for tracking the changes and showing them in the history, but there must be an edit button.