Photoelectric beam Motion Sensor

It seems like 30% of the posts here are about false alarms with the motion sensors. That is my experience as well. 

Has anyone found, or would Simplisafe consider, making a photoelectric sensor? Basically it's a beam, that is someone walks through it, sets off the alarm. They can be setup in areas that people would walk through, but pets (cats sigh) can't. 

This would be the solution to "smart" motion/presence alarms.....that are never "smart". The current motion sensors are either too sensitive, or detect nothing depending on where you put them.