I'm doing a scenario where the guest prefer gentle rides. Somehow, the Crooked House is a very popular ride. I notice that it can only hold 5 guests at a time, which seems lower than I remember, but regardless - even if I activate the cheat to unlock operating limits or vehicle limits, there's never more than 10-15 people on the ride at once, which would be equivalent to 2-3 buildings, not the max 31.
I looked around in (crooked_house.c), and ride_data.c, among others and didn't see any number for the ride's capacity.