Okay, I just checked and it does work for most rivers however there are some rivers, like in the area around Scythia, that cannot be crossed at all leading to a portion of the map being cut off completely by land from the rest. Without any river crossing.

this mod won't work for them but the script should still be functional.

Does this work for the Invictus version of INR?

gonna give this a try

Noice noice