I found a way to create water in maps!
Its not that perfect but.... it works!
1.Build the Map
2.Compile
3.Save
4.Now place some Polygons with a water colour!
5.Save without compiling!
Now you can walk into the water!

I don't know if you are interested in this, but I thought it might help![8D]

congrats, that's like already found out a couple of months ago :p first search and then post :p
anyway, it is still usefull for the newcommers ...

but you can tsee were your going