Navigable Rivers?

[a completely inoffensive name]

At least in RTW the roads are generated automatically by the game, and cannot be manually put anywhere by the modders.

Is that true for M2TW as well?

[MarcusAureliusAntoninus]

Is that true for M2TW as well?

Yes. It is, afterall, basically the same game engine.

[a completely inoffensive name]

I just thought maybe the improved engine allowed roads on the campaign map to be modded.

[Megas Methuselah]

The same effect could nonetheless obtained with a terrain type called e.g. "river bank" which would have a lot smaller movement cost than other terrains. So, moving by riverbanks would be faster without the need for invisible roads.

Is that even possible?

[a completely inoffensive name]

If you create the new terrain, I think so.

[Megas Methuselah]

If you create the new terrain, I think so.

But can you create new terrain?