Bainternet

Not really an issue with this plugin.

It works fine

take a look at my other plugin Author Category

Its a custom post type so you need to tell the shortcode what is the custom post type, take a look at the plugin’s Frequently Asked Questions for how to use the shortcode.

actually that filter is not the one you are looking for, Its called when using the IN_LIMITshortcode.

Instead you should look at the new post_creation_limits_before_limited_message action hook to output javascript to redirect the user ex:

<?php
add_action('post_creation_limits_before_limited_message','my_custom_redirect');
function my_custom_redirect(){
    wp_redirect('url_here');
    die();
}

In that function you can check the user role, post type or what ever you want.

you need to set the post type in the shortcode attribute ex:
[IN_LIMIT type="CUSTOM_POST_TYPE_NAME"][wpuf_form id = "X"][/IN_LIMIT]

just did on WordPress 4.0.0 its working as it should

Its not going to work since the plugin is not aware of the current post type of the form.