I had an issue of Starlog
magazine from around when Batman Returns was released, and recall someone who worked on it was mentioning they originally planned a bigger Batmobile sequence, including having the car driving up the sides of buildings.
So, they saved that idea for the next film.
Twas Burton's darkness that led to the studio pushing the franchise in the other direction. Making Penguin an infanticidal ghoul was probably not the best move. I mean, killing children, isn't that little...
(NO, IT'S A LOT!