Sometimes users accidentally reply to the wrong post. When that happens I often see them awkwardly apologize to the person they accidentally replied to, or delete their post just to recreate it replying to the correct person. I think it would be really helpful if, when editing a post, there was an easy way to change the “in reply to” post.
Here’s one possible approach:
When you’re in the middle of editing a post, you can click a reply icon to another post. Right now this either empties the contents of the editor (if you’ve made no changes so far), or prompts you to see if you want to abandon your edit (if you’ve already made changes). Perhaps somewhere in that workflow it could ask you if you want to redirect your post to be in reply to the post you just hit the reply button for.
Another option might be to have something in the editor itself, similar to the advanced reply options when creating a new post. But I’m not really sure how you’d select the new post you want the reply to be for in that case.
Anyway, I think this would be really useful (especially for newer members) if a good workflow can be figured out.