Closed Setups?

[BBmolla]

Are completely closed setups allowed?

I would include a "Possible Roles List," but the setup may not have all the roles on that list. Would this be okay? And if so how would I go by getting this approved?

Edit: By closed I mean the first post does not have the exact role list. Possible roles are posted, and people flip their role when they die, but the entire setup is not known til the end.