That sounds an awful lot like what emacs is doing in org mode (if you configure it too). I have to say, it's often nice, but sometime still gets in the way of editing in my experience. So I'm often conflicted if I want this or pure editing of the org without the rendering.
I was just going to comment about how bringing features like this to org would be great. Do you know if there's a way to have caret affinity displayed in org, or equivalents for the other features mentioned? Sorry if they're obvious features, I'm a bit rusty on the latest developments.
