My set-up is like this:
1. I have 4 custom post types added using ‘piklist_post_types’
2. I have configured a menu to group all the links to those custom types using WordPress built-in functionality (‘add_menu_page’ and ‘add_submenu_page’)
3. I want to add a settings page under the menu I created

I have tried the following scenarios
1. Use the ‘piklist_admin_pages’ filter to add the page under the ‘edit.php’ (or ‘manage.php’ or ‘options.php’) menu

$pages[] = array(
        'page_title' => 'My Options',
        'menu_title' => 'My Options',
        'sub_menu' => 'edit.php', // or 'admin.php' or 'options.php'
        'capability' => 'manage_options',
        'menu_slug' => 'special-settings',
        'setting' => 'special',
        'single_line' => true,
        'default_tab' => 'Basic',
        'save_text' => 'Save Settings'
    );

This makes the settings page accesible an is placed in the menu (only for ‘edit.php’)

2. If I try to put it under the menu ‘edit.php?post_type=my_custom_type’, where I want to put it 3 things happen:
a) The link placed first in the menu (although defined last). In the previous scenario (submenu => ‘edit.php’) the link is placed at the bottom.
b) The URL is wp-admin/special-settings
c) The page is not accessible anymore at an address that worked previosly (like edit.php?page=special-settings)

I hope this makes sense.

Is there a way to tell Piklist that I want to handle a settings page without using the piklist_admin_pages filter?