Global Shadow Toggle

I'm trying to figure out a clean/elegant way to globally toggle shadows on and off. Has anyone tackled this already? If so, how did you approach it?

 

I'd say somthing like:

Code (csharp):

1.  
2.     projectors = FindObjectsOfType (Projector);
3.     for (var p : Projector in projectors) {
4.         p.enabled = false;
5.     }
6.  

 

I rewrote it for C#, but it works great - thanks.