Is there such a thing? I read a lot about Cheater skis so I would guess anything goes?
Like the others have said-as long as you're in the right category, run what ya brung..........
That being said, there's an ongoing debate on the best ski for a NASTAR course, and the answer is that it depends. Course sets are variable enough that on some a slalom ski might be best, on others a cheater GS or even a Masters 21/23 radius ski might give you your best handicap.
Come on, people. I'm disappointed. There has to be a snarky comment out there perfectly matched to this graphic.