No ... have you? I am not too fond of the genre but at the same time I'd be interested to see what her non HP fiction was like. I've not read the adult novel she wrote under her own name yet either - I entirely forget what its name was.
I heard a bird cry, sharp and free. My name is Jordan.
I didn't really enjoy "The Casual Vacancy", but the newer ones are much better, modern day detective stories. And as for Hermionie and the plumber, there's plenty of those sorts of stories on fanfiction