Since many servers show the Config.ini as plain text and there many users that don't read the manual or the little line at the top.
My suggestion is:

a) Rename Config.ini to config.ini.php
b) Add a new line at the top:
; <?php die(); ?>

I assume the server as registered .php to be handled by PHP. PHPIDS wouldn't work without it anyway.

This is a security module. I think it shouldn't make it easy to make mistakes that lead to security leaks in a system.

Just a word about "; !!!DO NOT PLACE THIS FILE INSIDE THE WEB-ROOT IF DATABASE CONNECTION DATA WAS ADDED!!!":
I think you should never show your configurations. Database settings are not the only sensitive data in a system.
Knowing that a system uses PHPIDS can be very valuable information for an attacker.

Yes, and an additional .htaccess file in IDS with

deny from all

would be a good additional measure, there appears to be no directly accessed files in the structure.