Button Layout

Hello, I’ve recently discovered and downloaded RetroArch… I’m curious if any of you know a way to tweak the button layout to possibly include the iphones physical buttons.

For the iphone 6, the lock button is extremely close to the Z button area for gameplay and it would be at least 1000x easier to use if it were possibly made to be the physical button. I’ve been playing around with a few options but nothing looks like what I’m lookin for

any help would be great…

ty,

bg