Tahir
If any of our customer have any feedback which could improve the HC functionality then feel free to discuss with us.
Interesting that you should say that, I had feedback recently that would greatly reducce the confusion for a customer in a NAT environment and was told that I had to put up with it or get support from other users before HC would even look at it.
Back to the main reason for this thread, have you fixed the issues in the HC.php file for WHMCS yet. I have been trying for the last couple of days to get WHMCS working propery with HC and had to make some extensive modifications to the HC.php file to get it all to work. Even simple things like correct response strings were overlooked in the initial implementation.
Moon, if you want a copy of my modified HC.php let me know. It fixes the issues that you mentioned and removes the requirement for custom fields.