In any case we are dealing with a browser (even if built into a awesome app like Hype). Having a reload or refresh will be unavoidable if we start having plugins and more stuff happening on stage. There is always interactions or missing garbage collection. So, I think it would still benefit even if its only in the menu section like the iFrames. There is not perfect system and even in the current state without much third party tools, thumbnails could use a refresh from time to time. Like when linking new CSS etc. Hope that makes sense and leads to considering the request.