You can make some of the "subfields" of the address field required (or remove the requirement) using the frm_validate_field_entry hook.  If the past I've done something like the following (which removes the requirement from the line 1, line 2, state and zip fields) :

add_filter('frm_validate_field_entry', 'your_method_name, 10, 4);
function your_method_name($errors, $posted_field, $posted_value, $args) {
	$addressFieldId = ???; // put your field id here
	
	if ($posted_field->id == $addressFieldId) {
		unset($errors['field' . $posted_field->id]);
		unset($errors['field' . $posted_field->id . '-line1']);
		unset($errors['field' . $posted_field->id . '-line2']);
		unset($errors['field' . $posted_field->id . '-state']);
		unset($errors['field' . $posted_field->id . '-zip']);
	}
}