Having to find the metadata file and right click on it is onerous and creates an extra step when the file isn't in an originals folder. Instead there should just be a button or menu that says, "Create a Crosswalk", then the wizard can let you browse to the file containing metadata, whether that file is in an originals folder or not.
There is a direct button on the coolbar for this now. There is also a File > New option. Lastly, there is a "New Wizard" button on the coolbar, which presents a new crosswalk option.