Added the public mapeditor feature today. Still an early alpha version with some rough edges, like complete lack of bordering and decoration, but should still be somewhat usable!
Glad you like it. The view will be made bigger in the next version, and you can erase items by right clicking.
Water being green is a really weird problem, it works for me every time yet I see people getting green water in their maps all the time. Maybe I'll just say it's toxic water.