How can I use an IComponentActivator instance for a component, not just specifying a type.

That is, instead of

Component.For<XYZ>.Activator<MyComponentActivator>();

I want to be able say

Component.For<XYZ>.Activator(new MyComponentActivator(someImportantRuntimeInfo));

Also, is there a way I can choose an activator dynamically for a non specifically registered component? That is, I want to have an activator that looks at the type being resolved, decides if it can activate it, and if not, responsibility for activation should be passed on to the default activator.

So basically I want a global IComponentActivator that has the following logic:

Create(Type type){
  if (ShouldActivate(type)){
    DoActivate(type);
  }
  else{
    // do default activation here somehow
  } 
}

Thanks!