The "Authorization request" is purely something written into the software (the ICQ servers don't require that the authorization requests be adhered to). There were cracks to do this on older versions and if there aren't for the current version, there could be.
The other possibility is that if you have another program that can emulate the real ICQ program (like LICQ for Linux), by default some just never request authorization. No matter what you will be added to their list.
So basically, don't count on the contact list to prevent people from talking to you. Like was said on the first post, just add them to your invisible or ignore lists.
