Si si, works fine :). I think it is good enough visually to be classified as "quick edit". 
Cool demo

> From: deng@randomsample.de
> To: arthur.miller@live.com
> CC: emacs-devel@gnu.org
> Subject: Re: "Adobe Brackets like" editing in emacs
> Date: Thu, 20 Mar 2014 18:41:39 +0100
> 
> arthur miller writes:
> > I am trying to test the demo, but it asks me about Emacs C sources? Does it
> > mean
> > I have to download source code to check this demo out?
> 
> If you want to edit a core function which is written in C, yes.
> 
> Try one written in Elisp, like `split-window-vertically' or
> `narrow-to-defun'.
> 
> > I also get error if window is too small:
> >
> > Debugger entered--Lisp error: (error "Window #<window 7 on quick-edit-demo.el>
> > too small for splitting")
> 
> Yes. It's just a quick hack, after all. :-)
> 
> -David