How can I change WindZone settings with a script?

You dont need to hack around with reflections if you understand Unity typing paradigms.

The WindZone DataType is private in Unity as of 3.x - this is still true as of 4.5.x This means you cannot access its properties using strict typing (#pragma strict) and typeof(). This is because WindZone is not strictly a type (public data type), so if you try GetComponent(WindZone) or GetComponent(typeof(WindZone)) you will quite rightly receive an unknown data type error message from Unity Console. All you have to do is switch to dynamic typing, it is this easy in JS/US:

1. Remove #pragma strict from the top of your script.

2. Change any usage instance of GetComponent(WindZone) or GetComponent(typeof(WindZone)) to GetComponent("WindZone"); (Include speech marks!) and remove any variable type declarations from WindZone usages.

So instead of:

 #pragma strict
 var wz:WindZone = GetComponent(WindZone);

Your script should look like:

 //#pragma strict
 var wz = GetComponent("WindZone");

Now the unknown type error in Unity console will be gone and your script has access to WindZone script properties through the var called "wz" you can now do:

 wz.windMain = 1;
 wz.windTurbulence = 1.2;
 wz.windPulseMagnitude= 0.6;
 wz.windPulseFrequency= 0.2;

Now you have full run time visibility and control of your in game blustery goodness.

One option that I have used (in a WebPlayer where reflection hacks are forbidden) is to have an animation that changes the values. You can then play (or more likely, Sample, though I didn't need that much precision in my case) the animation to change the values.

i too was looking for Wind Zone class/references... there aren't yet! :(

One change you can do, assuming WindZone is marked as Direction, is access the WindZone's transform via script and rotate it. I tested that by adding a simple JS that I got somewhere to my WindZone's gameobject and watched my WindZone rotate (I only did Y) and my TerrainTrees react to that change realtime.

 var rotationSpeedX:float=0;
 var rotationSpeedY:float=5;
 var rotationSpeedZ:float=0;
 var local:boolean=true;
 private var rotationVector:Vector3=Vector3(rotationSpeedX,rotationSpeedY,rotationSpeedZ);
 
 function Update () {
    
 if (local==true) transform.Rotate(Vector3(rotationSpeedX,rotationSpeedY,rotationSpeedZ)*Time.deltaTime);
 if (local==false) transform.Rotate(Vector3(rotationSpeedX,rotationSpeedY,rotationSpeedZ)*Time.deltaTime, Space.World);
 
 }