As a Confluence user I would like to have the menu bar fixed on top of the screen.

Normally when you scroll down on a page the menu bar disappears.
When I want to create a page I first have to scroll up to see the correct button.

Off course you can use a keyboard shortcut (c for creating a page) but most users are not that experienced and would like to see the create button instead.
Besides that: for some menu options no keyboard shortcut is available.