Not sure, haven't there (yet).
For now, I will just use DVSwitch.ini in the /opt/MMDMV_Bridge4/ since DVSwitch.ini does not show up on the UDP ports listing anyway. As long as MMDVM_bridge4 show up, since I like to documenting things as I go, much easier for the house keeping.
I will try 5 when I have the need :)
Thank you for your help as always.