I would like the same feature. In a workgroup setting, team members with the same level of permission would ideally be able to edit posts regardless of the original author. It becomes very difficult to track levels and functionality when the permission is strictly tied to the author.
It helps to think of posts or pages as generic company info rather than individual opinions. Then anyone who is an authorized site editor can make those changes as needed as well as add new pages.
I have created a phantom user at a low level who is manually assigned the author of all new posts, so higher level editors can access all posts. But there is no way to track who created the post, should that be necessary.
