Hi, I'm Vladislav, the same person who told Ingo 'bout this trick. Many people got a little "angry" at ES just because they "took out" the trick, but we all know there's a way to hack stuff, especially if it's from Microsoft. Anyway, when I read the Readme file for the patch, I was surpised to see ES and MS do such a stupid thing, I loved that trick!
So I launched ROR, and clicked on "Scenario Designer", and messed with the shallows, I tried to delete 'em, but to my disappointment, they were "undeletable". I tried to make the swamps that you can place buildings on, I moved then placed the shallows, I haven't paid attention to that they're off, but in a minute, I realized that the tiles came off of the shallow terrain. THEN IT HIT ME! All we have to do is to move all the shallow tiles into one spot, then cover it up to make 'em invisible. That way, u can do the same trick.
So in conclusion, the tiles are simply undeletable, sure the moving takes quiete some time, but hey, blame Microsoft, not me!