How can I use MonkeyRunner to switch the screen mode(Portrait mode and Landscape mode)?
There is a indirect way,you can toggle between portrain & landscape, but only the setting page.Steps:-

1.Disable auto-rotate screen option in settings page,keep the same page open.
  2.Keep device in horizontally(It wont go to landscape mode as auto rotate is disabled
  3.Get coordinates of disable/enable by enabling 'show pointer location'
  4.touch the cordinates using monkeyrunner-it will goto landscape,touch again it will goback to portrait.
Switch the screen mode with MonkeyRunner?