Last weekend, during a practice session on a set of new Kumho 710's I picked up a small (1/8") self tapping screw. The puncture is in the center of the "tread" so could be plugged or patched. Is a race tire ever repaired or is that a "flat" out bad idea? Is the tire just "screwed"?

If it's okay to do a repair, is one method better than the other?