I'm noticing a lot of WordPress questions being asked on Stack Overflow lately. I can't flag these to be moved to wordpress.stackexchange.com because it's not in the list:
Can it be added? Are there any other Stack Exchange sites worth adding?
It's unlikely we can replace one of the five existing migration paths, but most of the WordPress-related questions will have the wordpress tag, which makes it an ideal example for my proposal to add migration paths based on the question tags.