It really won't take much time with as few fields as are on NDisles, and with Mindnao, 8 spawns, 60 minutes along with testing. A minimum intrusion change on Mindnao would be a good test to see how much it helps and then based on that, considerations to older terrains. NDisles requires too much flight time for the smaller numbers we have since no one is following the capture path the original builder thought would be followed. The path is pretty obvious if you start looking at how the distances were setup where the shorter distances between feilds follow a wheel pattern around the terrain. It wouldn't be much trouble to add spawns along that path. Build enough terrains and you start seeing the paths and rationals in other terrains.