[Plugin: WP Super FAQ] FAQ categories amongst normal categories

Hi,
I’m building a website that includes a search filter using a dropdown categories selector that uses the wp_dropdown_categories(); function.

This is all working nice and dandy, and it is very important for the site to employ this function because the categories are the organizational structure the site but the FAQ categories are not included in the equation.

Can anybody help me with this? The site is not online but the fucntion i have now is as follows

<form role="search" method="get" id="searchform" action="<?php bloginfo('siteurl'); ?>">
  <div>
    <label class="screen-reader-text" for="s">Zoeken naar:</label>
    <input type="text" value="" name="s" id="s" />
    binnen <?php wp_dropdown_categories( 'depth=3&hierarchical=1' ); ?>
    <input type="submit" id="searchsubmit" value="Search" />
  </div>
</form>

I’m guessing i should use some php code from wp_super_faq.php into the wp_dropdown_categories function within category-template.php but i dont know how to do that. Or perhaps a workaround can be arranged to just add the FAQ categories to normal categories…

Any help would be greatly appreciated!

http://wordpress.org/extend/plugins/wp-super-faq/