Saying SB is in Fiesta Village is kinda splitting hairs. To me, it's more on the extreme edge of Ghost Town, but does it really matter? It took me years to discover that Matterhorn at Disneyland is technically in Fantasyland, but I had never really placed it in any particular land.
I do think Knott's could use a signature coaster, but I also wouldn't argue more flat rides. I've said it before, and I'll say it again: a Vekoma Mad House, themed to the Haunted Shack, would be a nearly perfect attraction for the park. It wouldn't take up a lot of space, it's family friendly, it'd be the first one on the west coast, and is a modern take on Knott's history.
That, and improved food service. Hoping the new place by Berry Tales helps, but standing in other food lines (especially Ghost Town and Fiesta Village) are horrible operations. Way worse than Six Flags, even. Really, those food places with 60's infrastructure should be restricted to mobile ordering only. They aren't made to handle today's crowd demands.