Changing terrain wind settings during runtime

Hey,

I'm trying to access the wind properties of the unity terrain via script to manipulate wind speed during runtime. But there is no access to these properties in the terrain or terrain data class. Is there another way to change wind settings?
I also tried to change the bend factor for the tree prefabs but that didn't work either.
Maybe some of you could give me some advice as I don't want to rewrite the terrain tree shaders just to access the wind settings.

Thanks in advance.

Daniel

 

Wind settings solution:
MyTerrain.terrainData.wavingGrassStrength=x; // wind speed
note that wind speed, bend and size is swapped!

 

I wrote a simple script to handle this:
https://gist.github.com/STARasGAMES/2fa1e2b6b5d2cb7ab05cdc58d3f7c588