PPM Works discovered a new feature yesterday while editing a project in Project Professional 2016.
When inserting a new task in to an existing schedule, Project would create a placeholder with a 1day? duration, a Start Date, and Finish Date.
Project Managers now have the option of inserting a blank row using the new Blank Row command on the Task ribbon.
Note how a blank row is inserted instead of the placeholder.
Hope this helps. Please contact us with questions.