Physics: Can you adjust the physics afterwards?
Yes, you can. Craft Director Tools v2.06 (now called Craft Director Studio), includes a feature called (re)Simulation. The (re)Simulation button is placed directly next to the Record button. This function automatically records the input device values during a recording. When the (re)Simulation button is pressed, Craft Director Studio will use the recorded input values to make a new recording. The (re)Simulation happens instantly, starting att the current frame and runs faster than real-time to the end of the time line using the current parameter settings. This means that you can change the parameter settings and then press re-simulation. Craft Director Studio will then (re)simulate the recording with the new parameter setting.
Example: Change the stiffness of Craft 4-Wheeler Extended's suspension and re-simulate a sequence. Craft 4-Wheeler Extended will tilt more (or less) depending on what changes you have made to the suspension.