Override default theme in category shortcode

I've configured WPFD to use a default theme when using the
[wpfd_category]
shortcode, so I don't have to setup all theme options every time I create a new category, and because I use the same theme most of the time e.g. Table theme.

But on 1 specific page, I would like to use a different theme. Just this one time.

So I'd like to be able to overrule the default theme, for instance by adding an attribute in the shortcode, i.e.
[wpfd_category id="1" theme="tree"]

$themename = empty($shortcode_param['theme'])?$category->params['theme']:$shortcode_param['theme'];

Looks like it's actually fairly simple to add by modifying line 1263 in app/site/filters.php file :

$themename = empty($shortcode_param['theme'])?$category->params['theme']:$shortcode_param['theme'];