Allright thanks a lot Steempipe it looks great!
Just one more question: It seems that, although the colormap is moved, the bummap stays absolutely static, which does look good in screenshots but makes it seem unreal in the game itself because the water alwas has the same wave-shape. What would I have to add to the effect if I wanted to scroll the bumpmap as well, preferably in the opposite direction as the colormap?

EDIT:
Oh and something else coming to my mind: What would I have to modify if I whant the water to be influenced by camera.ambient or, if that isn't possible, by sun_light?