orientation toggle in the top menu should have a context menu with choices for landscape/portrait/dynamic, like in the Settings=>Display page.
a long-press dropdown would be easier than orienting the phone sideways and then pulling down the menu and locking it and orienting it back. (when e.g.: looking at an image with wrong exif orientation in a gallery app)
its ESPECIALLY useful for me as a bug workaround. sometimes the orientation sensor stops working on my phone and i need to go to the settings page to get landscape. restarting sensord (or restarting the phone) fixes it, but sometimes i dont realize its happening until i am about to show someone a landscape photo.