Hello, shamefully there is no custom taxonomy support (not yet). I’m working on the next major release which will include this and several other improvements, sadly I’ve been really busy working in some projects which have forced me to put in stand by its development.
However, if you really need this asap, then you could tweak the plugin by yourself. If you look into network-latest-posts.php file, at line 283 you’ll find this:
// Categories or Tags
if( !empty($category) && !empty($tag) ) {
$args = array(
'tax_query' => array(
'relation' => 'OR',
array(
'taxonomy' => 'category',
'field' => 'slug',
'terms' => $category
),
array(
'taxonomy' => 'post_tag',
'field' => 'slug',
'terms' => $tag
)
),
'numberposts' => $number_posts,
'post_status' => $post_status,
'post_type' => $custom_post_type,
'orderby' => $orderby
);
}
As you can see, there you can modify the default categories by those you want. For example, default taxonomy for categories is category and for tags post_tag, you could then replace those by your custom taxonomies for categories and tags.
For post types there is already one parameter called post_type which you could use in combination with those custom taxonomies to pull posts from wherever you want.
I hope this information helps you achieve what you need.
Best regards,
José SAYAGO