By combing FFD (Free Form Deformation), Transformation, Motion Curve, and Opacity Level you can fine-tune their parametric values to get your ideal dynamic behaviors.
You can define motion tempos to selected sprite elements, or to the whole prop.
You can custom create your own prop Action Menu by adding new animation elements to the selected prop. In this case, you can use the menu to open the car door, make the siren flash, or make the wheels roll.
Use the Action Menu Editor to add, delete, and arrange the order of your animation list.