I actually patched the plugin to include this functionality.
At line 211, I added the following:
if($field['sort_order'] == 'alpha'){
$sort_args = array(
'orderby' => 'name',
'order' => 'ASC',
);
array_push($args, $sort_args);
}else if($field['sort_order'] == 'alpha_desc'){
$sort_args = array(
'orderby' => 'name',
'order' => 'DESC',
);
$args = array_merge($args, $sort_args);
}
And at approx line 384 (after the last ‘field_option’), I added:
<tr class="field_option field_option_<?php echo $this->name; ?>">
<td class="label">
<label><?php _e("Sort Order",'acf'); ?></label>
</td>
<td>
<?php
do_action('acf/create_field', array(
'type' => 'select',
'name' => 'fields['.$key.'][sort_order]',
'value' => $field['sort_order'],
'choices' => array(
'alpha' => __("Alpha Order Assending",'acf'),
'alpha_desc' => __("Alpha Order Desending",'acf'),
'id' => __("Term ID",'acf')
)
));
?>
</td>
</tr>
I’ve attached the PHP file (as a txt file) for those that would like to see it.