I think the pinned menu concept is very nice, but the current interface allows for modifying/removing the pinned items too easy. A user can accidentally remove a pinned page or drag it to a different position because those options are always available.
It would be better if the pinned items are in "read-only" mode after pinning (can't remove or drag). An "Edit" option would allow the pinned items to be dragged or removed. This way, the user has to explicitly go into edit mode to change the pinned menu items and thus avoid accidental manipulation.