Problem solved for my purpose at least!
I edited plugin’s file:
wp-user-frontend/wpuf-add-post.php
and added small piece of code to check if current user has capability to publish.
$post_stat = wpuf_get_option( ‘post_status’ ); //find this row
//and add this code below to check user’s capability and modify $post_stat
if ( current_user_can( ‘publish_posts’ ) ) {
$post_stat = ‘publish’;
}