Youtube video format posts

Question about the correct usage of WP RSS Aggregator suite with YouTube sourced posts.

Is there a way to automatically write the original video URL into the body of the created post? (i.e. if I click Edit on the created post, the URL is contained in the post content window)

For the themes I have tested, to display a playable video window in the posts feed they appear to require three things:
* a post format of Video
* the URL to be included at the beginning of the post body
* followed by a <!– more –> tag.

Without all three things being present, the created post appears in the feed like a Standard format (i.e. text, not playable video window) post.

By default, the WordPress posts created for YouTube videos appear to have an empty post body (i.e. if I go to the created post and click Edit the post content window is blank).

I have tried using the Prepend and Append text options, but they do not appear to write to the same place (i.e. the post body content, as visible in the Edit post window).

However, if I manually copy and paste the permalink URL and manually insert a more tag into the post body, then the post displays perfectly as a playable video within the WordPress posts feed.

Any suggestions?

Thanks in advance for your help.