You're welcome. You can select it with the Q button and where is says full on the right side near the bottom click on it and you will see the 1.6x crop mode option. I put mine onto the C1 function so I only need to hit one button. I am not sure if you can assign it only to a button for just crop mode.
You most likely can add that to your My Menu structure too and then set the camera to also go to My Menu first instead of the last place. I put all my most often used functions/features in My Mneu (no more than 3), and then use those. This is an alternative to trying to set that in a custom slot which also then locks in other things you may have set.











I only notice a marginal difference....







