Add blog ID to recent posts widget?

Hi there,
Just experimenting with the recent posts widget.
I thought it might be a great enhancement if it was possible to ad shortcode to show the posts of one or more specific blogs, so I can put this in a post where I mention a certain blog / network site.

No big hurry with this, but would make it even more perfect.
Featured thumbnails, as I asked in my post a few minutes ago, is, as far as I'm concerned, a bigger "need"...

Thx and c heers!