Are questions about Retropie and configuration of the associated hardware and peripherals appropriate on this Q&A site?
Please note that this is different from the previous questions concerning emulation, as this more focused on configuration of Retropie hardware and not about the games themselves or emulation in general. Some of the this might cover hardware configuration scripts that are generated for various controllers, or it may include Raspberry Pi accessories such as the Control Block or Power Block that can be used with Retropie.