Yes, the widget supports including the Address Autocomplete API parameters using the "address_params" option. We've created a small example showing this behaviour on the JsFiddle website.

The example shows the "post_box" parameter being passed through, but you can include any of the API parameters at this point (eg: you could also include "rural: 0" to exclude rural addresses).

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widget = new AddressFinder.Widget(
	document.getElementById("address_field"),
	"XYU7FK4REMPDTWH3NQAV",
	{address_params: {post_box: 0}}
);