LOL, the solution for this fix was more easier than I estimate before!
The bug was not in the 3D structure of of the skydome, it was in the texture mapping coordinates. The developers do the unwrap job for the cloud's texture carelessly.
Here is the uvw map of the original cloud dome, in the center you recognizes that the coordinates are disordered and that results in the game in this well known distortion above.
I arranged only these coordinates in the center and brought them into a more ordered coordinate system and now there is no more distortion in the clouds and they move well over the sky.
I release the next days a fixed scene.dat. Modders who use the original scene.dat for their mods can rebuild their mods with it (I don't know what all these mods are

)