GAEA World Builder - How to make maps symmetrical?

Hey gents I am messing around with GAEA and thinks its pretty powerful with the nodes and stuff, but how would you make a terrain symmetrical in the editor?

@askaholic I am glad someone read some of the 20k words I wrote on this topic 🙂

"Design is an iterative process. The necessary number of iterations is one more than the number you have currently done. This is true at any point in time."

Newest map: luminary.png