The renew price option in 4.6 is one of the core updates required for the domain manager, and can be used now to support a separate new and renew price for domains in the current system. A separate transfer price and better support for domains is coming. While I don't have an ETA yet, we have been making progress. I know that it's highly requested, and much needed, and our 4.6 release puts us 1 step closer in terms of underlying core functionality to support the domain manager.