Have never tried, but if you do try it i would imagine you would have to soak it first or it would be like coating something with dried pasta. If you try it can you let me know how it goes, i would be interested to know :-)
Thanks for your answers, I used dried couscous in the end to coat my fish cakes. The turned out quite nice actually, very crunchy but this was a nice contrast to the softness of the cakes. Will definitely try again.