There are no server rules that dictate how camp lists should be enforced, so your gripe is entirely with the P99 playerbase. I'm sure it's been done before, but if I were holding a Stormfeather list I would simply say that you must be at the spawn in order to be next in line. When adding subsequent people to the list, I'd inform them that if they become runner-up (in the case that the current runner-up leaves or logs off), they must then be present at the camp or forfeit their spot. Any disagreement means they don't get to be on the list.
As long as it's consistent, and you're giving each player the exact same opportunity, it should be kosher under server law. The problem is getting this system accepted as server protocol, which probably couldn't happen without some kind of GM enforcement because most P99ers generally don't do things that require slightly more than minimal effort.
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