We have a kid who is capable of doing it, Skschlag. He is very talented on floor and vault. If he did it at a meet during warmups, he would never have to worry about vaulting again, because our coach would kill him. But I absolutely agree with your comment above. You cannot take what works for one kid and just use that as a template to coach every other kid on the team -- not for skills, not for progressions, and not for emotional and psychological management. Arnold may respond really well to tough coaching and enjoy being pushed hard. Bobby may need encouragement and enthusiasm from the coaches to try the hard stuff but will do it if coached positively. Carlos may have some fear issues and need to work drills longer, but could be the guy whose skills are the cleanest once he's comfortable competing them. And Demetrius may get surly and shut down when he's yelled at and required to do ropes, making it all but impossible for him to hear the feedback his coaches are providing the next time he does something.
JenJean, no coach is going to come over to your coaches and say, "gee, why are your guys all throwing their vaults on their first warmup runs?" They will instead talk about how nuts your coaches are at the hotel bar later that night.
Optional vault can be dangerous under the best of circumstances. These are not the best of circumstances. I hope a few coaches will chime in here. If I could wish anything in the world for you, I'd wish that your coaches would spend a year going to every optional clinic within arms' reach without any athletes at all and just watch, listen, ask questions, and learn.
Edited to add: why on earth would they worry about not having time to warm up vault of all things? Did they never go to meets before they had their top optional guy? I've been at meets where warmup times were shortened, and our guys will do a cold pbars or pommel set once in a while as a just in case. (I'm talking really maybe 2-3 times a season.) But not vault. Never vault. First because it's dangerous. Second because it is totally and completely unnecessary. Vault takes very little time to warm up, even if you have guys doing different vaults or using different table settings. Remember that no matter how the meet is run, the guys who are warming up vault are working in the same time frame as the guys who are warming up pbars and floor, which obviously take longer.