Questions on how to use order type

I took a *quick* review of the code, and it makes sense to me.

Some of the questions I have, that would be good to address on the project page:

* Why do a UI for creating order types if it's going to take code to select the correct order type anyway?
* With multiple types, how would the order type be chosen for the add-to-cart action?
* When does one really need a separate order type? (Please explain your use case)

A patch to Commerce Examples would be much appreciated, adding Order Types to the Order Example. It seems to me like it may make more sense to have people write code instead of using a UI as here.

Thanks for your effort on this!