I use my camera every day and these little tweaks would really help.
Intervalometer: add option to take next photo as soon as the last one is saved to the card, rather than having to pick an integral number of seconds. Astro context. Could be implemented as a software ‘click and hold down’ shutter since D850 can take ‘infinite’ photos in continuous modes without choking (unlike previous models).
Intervalometer: add option to display the photo for N seconds after each exposure (as long as that does not delay the start of the next exposure). Currently the display just flashes. Astro context.