eromrab
Naked Pirate
My idea is to introduce an expansion with walls and canals- improvements build on the edges of tiles. Walls give a bonus to friendly units in a tile next to them and replace the current ones in cities. Canals look and operate like rivers, but are built. They must be built starting from a water source to a water source and each tile must border flatland.
That would ruin the point of canals for moving boats through them... the military strategy part of a canal is just as important as the trade benefit, if not more.