Here's the thing.

If we ever get a new BJ album with a different producer, then yes, it will probably sound quite different than the Shanks stuff. However, I really doubt that this is due to Shanks being unable to get different sounds. According to JS interview with Johnny from the Goo Goo Dolls, HE was the one who said to write a Bon Jovi song when JBJ wanted to do quasi-country. The guy's a producer, not a dictator. He does what JBJ (or "the band" - yeah, right) ask him to do. Hell, Shanks did "Who Would You Die For". That sounds like something from Destination Aynwhere. He can do that sound, too.

Of course, if JBJ ever got so far out of his comfort zone to actually use a different producer, he's probably be in a different headspace altogether. As it is, he wants Shanks to do what we get. I have 0% doubt that JBJ is calling the final shots.