Edit your race file (.xml), Replace all sea="1" by sea="0" (if any), Remove rivers data between <rivers> and <rivers /> tags (if any). Run the game et voilà !
And if it works for PCM2005 too, please give feedback
as i said on pcmdaily thread, there's not those parametes in the GraphicConfig (.xml file). I'll try to put almost all parameters at 0 to see what i got.