In this rollout you can define custom objects and their options. This feature gives you the ability to create any object at the impact spot. Using this feature you can create your own particle system, adjust the properties, and assign a material. You can then animate any of the properties at 0 frame.

For example: Animating the Rate properties. Push the Auto Key button, go to frame 0 and set the Rate: 0 then go to frame 3 and set the Rate: 50, then go to frame 5 and set the Rate: 0 again. Next add this particle system to the Custom object list, check the Synchronize checkbox to ON, and create the simulation. RayFire will create the same particle system at every Impact spot and shift the Rate animation at the Impact frame for each particle system.

Using this technique you can create any animated type of object (Geometry, Lights, Cameras, Particle Systems etc.) and RayFire will create them and shift their animation. You can also animate their position, rotation and scale.

Z Axis rotation variation : Add variation in Z axis rotation.
Random Seed : If you use particle systems as Custom objects, RayFire will create a different seed in each particle system, check this checkbox on.
Synchronize : Synchronize animation in created Custom objects with Impact frame.