I had this discussion with upstream when they made possible to place the window manager bar out of the screen. Usuability studies show than right click is not as discoverable as you think (probably the reason of the 1 button mouses from Apple) and GNOME upstream recommend make all the useful actions available from somewhere else than the context menu
If you want to discuss it better to go upstream, we will no override upstream on that -- Context menu opened when a window edge is left-clicked https://launchpad.net/bugs/45962 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
