In future, when we have folder and separate file based file/project formats (you are going to do that for 2.0, right? xml format :)? ) there could be a feature to save a runtime state into xml file - like there's the current save state binary format - and import the object position, rotation, size etc. data to layout editor in edit time, or have simply a XSL sheet based tool which would effectively CONVERT that data into a layout xml file! That way you could position objects runtime and see them in the "wysiwyg" manner, and then have "what you see" as a layout file.
(Btw. separate xml layout files would allow also runtime layout loading! And that you could make your own level editor, and have it to export xml file, and import in construct's level editor! And and and... many kind of things :D)