We can setup a [Trusted] rank or something that is granted to people who are trusted to be involved in shared trusted builds. We could then setup regions and only allow those in the trusted rank to build there. Come up with whatever title you want for the rank. In terms of the whitelist. It's a chore to be honest. The one advantage of a whitelist is that it keeps our mcforums post bumped CONSTANTLY. But I'm working on other solutions to keep it bumped constantly across all our 3 minecraft servers.