Like others I'm irritated that Nikon limits what can be assigned to each button - because reasons - and you don't know what's available for each button until you try. This forces you to make certain sacrifices unnecessarily, I don't understand why they don't just make everything selectable on all of them - they're all just buttons after all. I wish I could re-assign the Release Mode button too, or e.g. the Delete button when you're not previewing, but nope.
Another irritation: though it's great that we now have the option on the Z6/7ii's to have a clean live view without clutter, why oh why did they add this to a button function but not to the Display button cycle or the i-menu? I just don't have any buttons left to spare for this. And ffs Nikon uncouple the histogram and allow us to toggle it on any screen. Canon are just miles ahead on display customization options here.
I also realized that there are a lot of features of the i-menu that can be somewhat hidden unless you really experiment with each option. It has some unique UI properties with certain functions that just make it really easy to use compared with the equivalent Menu settings. Bracketing works so much more smoothly with the dials and it's quicker to dig down into the options; likewise ISO sensitivity on the i-menu gives quick access to the min/max range for auto-ISO, which the dedicated ISO button doesn't. Viewfinder brightness in i-menu toggles automatically between viewfinder and screen, depending on which you're using, much better than digging into the setup menu, etc.
Otherwise like you I have joystick set to same as multi-selector - I don't know why Nikon don't just do this by default, otherwise it's quite annoying if you accidentally knock it in preview or menus and it kicks you out. Also like you I have 'Release button to use dial' on, as I don't see any downsides to this with any of the functions, and it can be very tiring on the fingers otherwise.
I put Preview on the Record button as this seems a logical place for it right next to the shutter release, and there's no real equivalent for this DoF-checking function anywhere else in the absence of a dedicated button.