Drop-down list contains prepared paths. The beginning of each path is attached to the current location of object (Position, Angle, Scale). Therefore after editing these values it is necessary repeatedly to select the same path from drop- down list.
Field Speed scale sets factor of speed of movement on the path: 1.0 is starting speed, values are less 1.0 reduce speed, values are more 1.0 increase speed. Minimal speed is limited to 0.01.