Is it possible to edit each individual 3D path point?
Yes, all points in a 3D Path can be edited.
Select the path from the 3D Paths list
From the Windows ribbon, open 3D Path Properties
In the 3D window, right click and choose Edit>Modify 3D Path
The 3D Path manipulator will appear
In the 3D Path Editor window>Keyframe tab, you can use the arrows to switch between keyframes
Use the manipulator to move the points, or type values in the Position and Rotation text boxes in the 3D Path Editor>Keyframe tab
Changes are saved automatically
If the Path is assigned to a resource on a task, select the Path, the Task, and the resource to see the object in place as you edit the path. You can also edit the timing of the keyframes for an assigned resource, by selecting the desired Keyframe, moving the focus time to the desired time and pressing Capture Keyframe in the 3D Path Editor>General tab