Mapping Cut Line Feature Request

One of the features I really like about mission planner is the ability to map any shape. This would be a very usful feature in MME. Cut lines and park trails take many hard turns and have many twists. We can plan our flights perfectly with mission planner in these areas but would like to use MME for these jobs. The need is for custom shapes such a an L or a gradual turn. We want to drill down directly on the area and dont want the excess data around the trails which is what we get using MME. Is there any chance in supporting different shapes in the flight polygon such as an L.