Back on this topic. I have been working on something that hope to release soon
I do not know how to reconcile wysiwyg inline editor+drag-drop with custom layouts. I am leaning for a single html layout similar to the new web2py welcome app (skeleton) and arbitrary customization using css only. This opens lots of possibilities but the CMS could not use existing themes. Converting concrete5 or wordpress themes would be a pain anyway. Any ideas? Suggestions?