Re: Global menu bars?
Piffle. Stuff and nonsense. It was just a way to avoid an Apple look-and-feel lawsuit. In the early days, everyone put it at the top of the screen, because of Fitt's Law. Amiga OS -- but you had to right-click to open the menus. GEM, but they opened themselves. All just ways to dodge litigation.
Only Acorn and NeXT put thought into it. NeXT put them into the corner and made them vertical, as the corner is nearly as easy to hit as an edge. Acorn went one better: the only menus were context menus, with a dedicated mouse button to summon them. Saved both screen space _and_ mouse movement.