Hi. Ronin SC 2+Raveneye+Nikon D850. With Ronin APP how can I half-press the shutter button to focus the scene?

I haven't found this either, but it would definitely be an important feature for photographers!

+1
Half-press is such fundamental part of photo and even video.
Most of the remote cable releases have the half-press function.
All the Ronin gimbals have it on the shutter button, so it should be a simple matter of enabling it in the Ronin App.
Of all the features request this one is the most important and basic one to have.
The Canon app implementation does it using a separate button, same as the Panasonic.

Also, HOLDING the shutter button needs to implemented ASAP to be able to use Burst, AutoBraket, Bulb shutter, Pre-Burst, etc functions.