Adding the capability to set preferential defaults would save us a LOT of time when doing mass mission planning given that a majority of our missions are similar.
For example, a typical mission I create is fairly basic ortho mapping, and is flown at 200 feet AGL, with 70/65 overlap, and no enhanced 3d or perimeter shots.
To be able to have those as my default mission settings when creating new missions would save me a minute or two per mission, and when planning hundreds or thousands of missions in a sitting, that adds up very quickly.