Extend Automatic Factories to automatically use Parameter Overrides
The current system of Automatic factories in Unity defers resolution when a class's constructor has a dependency of Func<IMyService>. This could be extended to automatically use parameter overrides when it sees a dependency of Func<SomeType,IMyService> and the concrete class implementing IMyService needs a parameter of type SomeType. This would only kick in if an InjectionFactory of the required type wasn't registered.
Sebastian Weber commented
That feature already exists though it is not shipped as part of Unity