This doesn't quite answer your question but I have a couple of workarounds:
You could download the Youtube video by using the DownloadHelper extension in Firefox. (Dont download videos illegally, kids!). You could then take a look at your components palette in Flash and embed the video in your project using FLVPlayback or Mediadisplay etc. You might be able to get the URL of the YouTube video itself using this method but that won't be legal I'm sure.
Other than that, use several SWFs to make your web page and use frames...then be slated by accessible web designers :)