That option isn't selectable in Indigo because it is not Indigo compatible. The INSTEON Motion Sensors, when that jumper is set, only sends the ON command if the delay period in the Motion Sensor has expired (X10 motion sensors will re-send the ON after just a few seconds of delay). So with that jumper set these two events would result in the exact same command sequence being sent to Indigo, which would be a single ON command at the beginning and no subsequent commands:
1) User walks by the motion sensor and then never walks by it again.
2) User walks by the motion sensor every 55 seconds all day long.
Basically, IMO, having that jumper set is never a good idea. Once it is set the Motion Sensor ceases to be useful from the perspective that receiving modules cannot differentiate between a single motion event and N motion events that are less than 1 minute (or maybe longer) apart.