The ability to draw in lines that arent neccesarily on the 3D model would save a huge amount of time in certain scenarios. I recently had a project with multiple variations of the same product, of which included creating multiple 3D models, this could have been prevented if I had the ability to draw one simple line by 'hand' in the drawing format. This is something I did quite often in Solidworks and use it not only to add-in lines, but as a measuring tool to space drawings as I wanted them.
Hope others feel the same and I havent missed anything here!