Hi Dave,
This is the first time I hear about this concept. Condes does not currently have any specific support for this.
The international standard is to show the mandatory crossing points on the map, if necessary together with a boundary line that follows the fence or other obstacle that cannot be crossed. The boundary line indicates a "no-crossing" boundary, and it it thicker than a leg line, The leg line should in this case be a bee line between controls.
Obviously, I am not familiar with the reasoning behind using two lines, but in general I would recommend sticking with the international standard practice. If for nothing else, then to avoid confusing people who are not familiar with local conventions.
regards,
Finn