In order to get the subject fields to reveal in the feature editor one must either add the feature to the release roadmap or another action I can't recall at the moment, neither of which is very intuitive. It would be more convenient to have a control right in the editing dialog to display these fields.
Why are these hidden at all?
Per your request Troy, this is what I'm calling the feature editor. It's the dialogs one uses to create and modify a feature.