If you accidentally post something on Public Feeds that you wanted to post on Friends Feeds (or visa versa), the only options are to leave it, or to delete your post and repost it on the correct Feed. I think it would be nice to allow you to switch the post from one to the other in the Edit Post box.
Also, right now when you go into Edit Post, the only things you can change are the text, the drama tag, and the spoiler tag. It would be nice to be able to edit other aspects of the post, like links or pictures.