Can you write a unit test / demo example?

Yes, but I am not up to speed on the testing conventions so this could take a little time.
Should it just be a simple test case that is really more like a demo, or should it try to test many possible combinations? (I assume that this feature would not be used much since nobody else has needed it - in that case I hesitate to add a lot of extra baggage in there)

Also, should I do anything about the missing shim file, or just leave that as is?

I already fixed the collections/shim - this is known problem with Q.v2, just pull this repo into your fork again to get the change

Take a look at the npm run demo-use command - it just runs a simple example. In your case create another example that applies two transforms to a required file and then console.assert that the loaded object has been transformed by both, ok?

Okay, I will pull it again.
I will try to add a test for 2 transforms on the same extension using the demo use-case example. thanks

I added a test case for nested hooks and it passes.
Do I need to make another pull request or is this one still active?

Published as 0.2.0, thanks for the feature!