Smart ideas @wattahay but the community is ahead of you on this one.
You may find this better as a thread of its own. There are multiple opportunities to do what you want with the current versions, from multiple story rivers, edit in the sidebar, to open for edit in a new window, with or without closing the tiddler in the view template allowing a preview of the edit, this is why some favor wysiwyg, as its both at once.
- Although such additions to future versions may be good they need not break backwards compatibility which is what 5.4.x is about.