In my ConfigureFubuMVCcs I'm doing things like this:
Services(s => s.ReplaceService(MyService)); and
Services(s => s.SetServiceIfNone<IMyService, MyService>());
Alternatively if I have many related services to register (examples: AutoMapper or RavenDB), I create a class that inherits from Registry and put them in there instead
Is that what you're referring to?