MappingGenerator offers code completions for completing method invocation parameters in a single run. They work in a similar way as Invocation Scaffolding action but they are available straight from the Intellisense menu for typing convenience.
Code completions are supported only by VisualStudio. When using VisualStudio with Resharper you need to review Resharper settings to make sure that they are not disabled. Check Using with Resharper section for more details.