1. https://drupal.org/project/entityreference_dynamicselect_widget 2. https://drupal.org/project/entityreference_view_widget 3. https://drupal.org/sandbox/davidseth/1489176 4. https://drupal.org/sandbox/iztok/2224119 From iztok's demo: 4/ is basically 2/ with an extra list of currently selected entities in the sidebar.
From iztok's demo: 4/ is basically 2/ with an extra list of currently selected entities in the sidebar.