I’m pretty sure someone has requested or at least mentioned this before, but it would be nice to be able to maintain a true square or rectangle when flight planning. As with most programs pulling from the corners maintains aspect ratio. Having a nice symmetrical shape just makes it easier to get the most efficient flight plan, but more importantly just looks good. Unless you have the needed software it is a pain in the rear to make them look nice afterwards.
Tip - You can use GIMP (free) to edit GeoTIFFs exported from DroneDeploy. Just do not change the dimensions and the world file will still drop it in correctly.