I've been finished the last big feature for release version 1. The editor needs for LOD a blurry smaller texture than the detail texture. With this low-res textures the editor turns all 4 detailtextures and the shadowmap into one texture in the LOD models for better framerates.
With this medthod you can also export the terrain and used it in extra and standard editon of 3DGS (with less quality, but hey, more than nothing ).