Gyro_Force_AddProperty_Persistent(entity force)
This function will apply the persistent flag to the given force entity, which will cause it to then ignore many of Gyro's transparent removal calls. Such removal calls may be made by the automatic scaling of the force's power and range and by the removal of the force's host entity, should it be attached to one. When flagged as persistent, ensure you take steps to remove the force yourself if/when it is no longer required.
Gyro_Force_RemoveProperty_Persistent(entity force)
Removes the persistent flag from a force entity, re-allowing Gyro to automatically clean up the force when it is no longer in use.