I would like to be able to edit or delete the merged comment
yup, just accidentally merged a post into the wrong feature request and now it's stuck 😭 Can't edit / move / delete it.
Currently, once you merge a post you can't edit it or delete it. Someone snuck a backlink into a post that we want to remove but we have no way to eliminate it.
Since you can edit before merging it'd be nice if you could also after merging.