Will You ever release the Avia Layout Editor as a standalone component / plugin. I dreamed about starting a template from a CSS/JS framework like Bootstrap or Zurb Foundation and the Avia Layout Editor could be an invaluable help in making users edit page contents.
Avia is more awesome than these plugins. A plugin that is in your league is Page Builder http://siteorigin.com/page-builder . It has the idea that the addable elements are widgets, so you could extend it by adding widgets. Have you thought of allowing users to add widgets. not a widget area but just an instance of a widget.
I love your Enfold theme tho, and the Avia is brilliant. Would be totally brilliant if you made it into a plugin.