Well I know you can set wind on the terrain, but does it actually interact with in-game objects? Say I created a sphere, and set the wind to 1, would the wind "push" the sphere around at all? If not, I am creating a desert and I want tumbleweeds to be moving around, but I am unsure of a way to make them interact with the wind, and also not to accumulate on the edges of the map.
Wind only affects grass and other small details directly attached to the terrain. If you want to simulate something rolling, you can set its velocity manually, or you can apply a "force" to it so that it rolls at a constant speed. Simply attach a Rigidbody to your sphere and, using scripting, either set the velocity and angularVelocity properties manually, or use AddForce() to propel the sphere.