How to map key to take a picture?

[snowmaiden11]

I was hoping someone here has either done this or knows how. I want to map one of my hard keys to take a picture when I'm in camera mode (trying to align your finger with the on screen button if you're taking a picture of yourself is almost impossible). I've been using keyboard config to map a lot of my keys already but I can't seem to figure out how to make it do this - I can make it open the camera app but not how to execute a function INSIDE of it. I would really appreciate the help. Thanks!