Nikon has been adding features of that type as it moves into its mirrorless systems. The D850 and D500 have added very nice things such as that (live view only, because otherwise you need an EVF), but Nikon rarely goes back to update features on existing systems. Does anyone ever hack Nikon FW?
Nope, only seen the hacks with Canon. There's a website that focuses on hacks for Canon. Don't know why I mentioned it as I can't recall it. Google would likely show, but I'm too lazy to go and find. LOL. If you want focus peaking look at the D500.