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An additional API should be added for users to provide custom injection modules to allow programmatic configuration of other injectable instances. This may be useful for unifying some ServiceLoader-related APIs in Log4j. These modules can set up bindings for configurable classes outside the normal configuration system. For example, if injection begins from Log4jLoggerContext, then these modules can be used for programmatically configuring a ContextSelector and ShutdownCallbackRegistry instead of relying on optional system properties to specify a class name. Programmatic configuration from a ServiceLoader-created class simplifies class loading as direct references to classes can be compiled in directly. When injection begins from a LoggerContext, modules can customize classes that are global to a configuration or logger context. This also provides a natural place to define or override ConfigurationFactory instances. Other programmatic instances needed for various plugins can be more easily specified through this API.