Optical pad to wake the phone?

Google what you are talking about and there are two maybe three apps in the market that will do that for you. I found they were spotty at best. I was coming from an iPod touch and my muscle memory was trained differently.
 
It would be nice if there was a native option. But I.am I am training myself.

I have lockbot pro which allows you to wake the phone with the optical pad, but the volume keys do also....which I don't want. So there are limitations.
 
There are apps that do this as mentioned but they all have bugs that are annoying to me. When this thing gets rooted, if ever, lol. This will be implemented in a rom by someone I'm sure.