On Volkswagens, nag screens like that (and "menu disabled while vehicle is in motion" lockouts, and a million other things) can be tweaked with cheap dongles that let you change settings using your phone or laptop. Maybe there's something similar for Nissan?
Ya know, now that you mention it, there are apparently dongles of some sort (perhaps OBDC? It's been a while...) that give all kinds of extra info, maybe there's something like you mention. It's been a while since I've been over to mynissanleaf.com, perhaps it's time to go pay a visit for a search.
Thanks for the prompting.
EDIT: though it does not look like the tool will disable the nag screen, LeafSpy Pro does a lot of other things Leaf owners might find handy, such as change the backup warning tone, door unlock/lock behavior, et. al.
OBD2 / OBDII refers to generic powertrain diagnostics (engine, emissions, etc) for all vehicles. Plenty of dongles for that. But I mean something that emulates the tool a dealership would have for specific makes of vehicle, which goes far beyond just the engine, extending into every module, possibly like what you found. Although usually it would be for a family of makes, not just a family of models.
For VW/Audi/Skoda/Seat the popular ones are VCDS and OBDeleven (the name of the latter being a play on OBDII, confusingly, being that I am trying to differentiate actual OBDII... ugh).
I just imagined the wireless unlock button sequentially stepping through the 16 lock/unlock states for a 4-door vehicle. "The car is locked. 13 quick clicks later, both front doors are unlocked and both back doors are locked."
