use hammerspoon to avoid triggering the menu bar, unless you hold alt

gistfile1.txt

-- don't trigger menubar in fullscreen mode unless you hold alt
stopmenu=hs.eventtap.new({ hs.eventtap.event.types.mouseMoved }, function(e)
      local flags=e:getFlags()
      if not flags.alt then
         if e:location().y<1 then
            e:location().y=1
            return e
         end
      end
      return nil
end)
stopmenu:start()