Learning curve for Z7/Z6

>I have always found the below settings to be very useful for
>the OK Button:
>1) In playback mode I set the "Ok" to provide a
>quick large Histogram
>2) In shooting mode I use the "OK" button to return
>the focus point to the center position. Helpful with Z series
>which doesn't have the ability to lock the thumbwheel causing
>focus point to move around by accident
>3) I then set the f1 button to zoom into 100% which works for
>either playback viewing or focusing in shooting mode.

Hmm. Since I started using the OK button for magnification I am missing the quick large histogram. I may move the magnification functionality to Movie-record button and free the OK-button for the large histogram and centering the focus point as you suggested. Currently, I center the focus point by pressing the sub-selector/ joystick.