View Only Permission for Process Models

We current have process documentation in Visio that we would like to transfer to Process Manager by importing them as models. While we want users to be able to review these documented processes, we don't want anyone but a particular sub-set of users to be able to create new BPMN process models until we've been able to strengthen our knowledge of process best practices. If I can import their Visio processes into Process Manager and make it our centralized process repository it will reduce the load of redocumenting processes from one system to another, and increasing adoption of Process Manager.