I think there should be a new ship class for better travel on river terrain. The djonk (3 river, 4 ford move cost) and the galleon (4 river and 5 ford move cost) are useless for movement along a river. The galley currently gets 2 move cost on river and 3 move cost on ford tiles. Even with this reasonable movement though I have found that units with terrain bonuses, often the fastest way of travel is to disembark from the galley and go on foot even if the river is a straighter path (assuming the river has fords in it).
So maybe the addition of a high risk, high reward river craft would add to the game. Something with high moves like the galley or galleon, something with 1 move cost river and 2 move cost ford, but has low strength maybe 10 or 15 and movement outside of a river would be horrible limiting it to rivers only.
garvisus