Your proposals take things a bit too far without any real return. Blocking access to devs who don't have an app in the store is counterproductive, because that

Your proposals take things a bit too far without any real return. Blocking access to devs who don't have an app in the store is counterproductive, because that prevents the developers from testing against the latest iOS and finding bugs -- which is the entire point of access to the iOS beta! Not to mention some devs might be working for other clients and not yet shipped something themselves (as in my case). Requiring installs via Xcode would only be a temporary slowdown before someone figures out the secret handshake and hacks around it. Blocking reviews from devices with the latest iOS beta installed should be sufficient to eliminate most of these unfair reviews.