Warp point question

[Q]

In the CampaignData.txt you have the line "Map Conn XX Connection Type" for system connections with possible values according to the Modding manual of
- Two Way - Always
- Two Way - Destination Initiated
- Two Way - Source Initiated
- One Way Only

Are these functional parameters?
The stardard game uses only the first possibility. I changed one connection to "One Way Only" but didn't see any effect.
If they function, how do you use them effectively?