[Caspar]

you can have shallow water on maps but you can't have brown rivers and blue sea ...

and its been done by editing map_C.tga

Z

Shallow water uses an additional texture - the 'rivercoast' one; RGB 30/30/30 - , so you can paint it, whatever you want and all you need is to make every river shallow and keep the ocean deep. Coast areas will be same color then though.

(Bessarabia example)

Water0 = water/Water.tga
Water1 = water/Water.tga
Water2 = water/rom_CoastLine1.tga
Water3 = water/rom_fields_Beach.tga,2


EDIT: this is meant for 'hardwareshader = 1' ... about '= 0' I have no clue.
May work as well though.