Terrain Detail Mesh Collisions

Is this is a supported feature?

http://unity3d.com/support/documentation/Components/terrain-DetailMeshes.html

The above page doesn't mention it but why would you place rocks around a level which you could walk through? I've managed to get collisions with trees working by using a prefab with a Capsule Collider but having no luck with the same method for details...?

Anyone got a solution?

Matt

I guess No, cause the "detail mesh" is just to detail your terrain, like flowers and anothers small objects. If it uses colliders to details then the performance get down.

I guess you need to do the same as the trees, create a prefab with colliders and use the "Place trees" tool.