Trigger spotlight with camera sensor?

I am about to buy the wired floodlight camera. I am curious as to why there isn't the option to have the floodlights triggered by the camera's motion sensor rather than the PIR sensor. One of the major annoyances with PIR lights is having them light up every time a cat walks by. The 'Human Only' option for motion alerts suggests that the software has the ability NOT to do something (send a notification) if it isn't a human that has triggered it. Why can't this be applied to whether the light comes on or not?