Well, you asked for it bassicaly turn it into NO WAY OUT, and theme it to an ancient temple, cursed kind of have an element of mystery around it and remove everything that says it goes backwards. Instead, put a sign up saying no-one knows what to expect once inside. Cut out the cattle-pen that's on the outside, so queing is only inside. Whilst there, there are noise, models and occasional live-actors & air effects to make you jump as well as flashing lights and the inside cattle-pen area in complete darkness.
Then once you're in your car, which would be totally re-painted, instead of the normal backwards start, your car goes forward before coming to a dead end, where people would of normall got off. Then you hear fate muttering and your car goes backwards, the rest of the ride has slight water, light and air effects but nothing to major. Then at the end, they could expand the building into a sort-of mirror-maze like Houcus Pocus Hall at CWOA, only scarier.
Thought it would be great, but doubt it will happen! :D