I just attempted to enter an artist-level CD Baby URL (http://store.cdbaby.com/Artist/RocketCat) and the autoselect went through, but the URL is still marked as "not allowed or incorrectly formatted."
Apparently the autoselect recognizes "www" URLs but not "store" URLs, while at the same time manual attempts to replace "store" with "www" are thwarted by URL normalization already in place.