One possible improvement that can be made. In the planner section, after drawing a polygon and clicking generate. The hatch angle slider should show the proposed path and update as you change it so that you can tweak it without it having to click ok, check it, clear the wps, and go back in and generate a new one if it's not right.
Also the path generated is a zig zag, with one waypoint at each turn rather than two. The way that Droidplanner generates the waypoints is it'll generate a path that has two waypoints at each turn, which creates the spacing between rows. See what I mean in the screenshots.