Hi,
Imagine behaviour that allows you to specify how much objects You are spawning, what colour filter they have or in which angle and speed of motion they will be moving, also it could contain some events like "on creation" and "on destruction".
Also Copy/clone object would be very usefull sometimes.
Example:
on box destruction : adv_create 4 planks in random motion.
I think its usefull. I might be wrong.