I have being thinking I would just leverage the missing tiddler state !has[tittle]through a standard view template to display a panel. No commitment yet to hiding the edit button, but a desire to establish a mechanisium to alter the buttons or other qualities of a tiddler in the story river through a dynamic stylesheet, in the view template. Without resorting to the other cascades.
- So not exactly a purpose built editor, more providing some canned tools from the view template.