When I write a comment, I often permute the backticks. So I have to edit it. When it is not much work to implement such a feature, it would be nice :D.
A workaround is to go to the Formatting Sandbox, a pseudo-question on the super-meta site that exists specifically to allow people to experiment with formatting. You still may need to do repeated edits to get it right, but at least people won’t be watching you while you do it.
I think you can edit your comment in the
answer box, after you finish editing, you can copy/paste to the
comment box. They share the some common rules for editing.