Improve sticky navigation behavior

Problem/Motivation

We have a sticky navigation theme option which, when turned on, make navbar region sticky on the top when user scrolls the page. That is a nice UX improvement because main navigation is always on the page and easily accessible. The problem is that this sticky navigation always ocupies vertical space and is decressing main content readable space.

One possible improvement for this is to hide navigation on scrolling down and then when user scrolls up show navigation is sticky mode. Then if user again scrolls down we should hide navigation. This is a pattern that can be seen on many websites this days and it would make a nice improvements for our sticky navigation.

For now I am not sure should we just change behaviour to this or add an option to enable/disable this behavior? For new sites we would definitly enable this by default.