Each vehicle has its own server-side TurnSpeed variable, which can range from 0 to 999.
By default, when a vehicle is created, this value is set far below the maximum, which makes vehicles turn very slowly.
The addon listens to the UNIT_ENTERED_VEHICLE event and sets TurnSpeed to its maximum value of 999 once a player steps into a vehicle.
This change enables instant turning and allows more control over catapults, demolishers, glaives, siege engines, siege engine cannons, and tower cannons.