BTW, Warpstorm, why do the river deltas sometimes appear in the coastal tiles? Having played on the original tileset only once, I don't remember if this is supposed to happen; but the only other tileset I use is someone's (I regret I don't remember his callname) wonderful but incomplete 'handdrawn-style' tile set, and the deltas never form in the coastal tiles on this set.
And the fact that one set will misplace the delta while another will not confuses me because I am assuming that all tileset modding uses the same technique in replacing the originals.