It's been a week & you've gotten no other reply.
Although I have no idea how to do what you want to do, here are some suggestions on how to find your answer:
Look at it as a dansguardian & not an IPcop Q. Look for help through dansguardian, not @ ipcop.org.
For instance:
http://www.google.com/linux?num=100&q=dansguardian
yields:
"Results 1 - 100 of about 47,900 English pages for dansguardian with Safesearch on"
and:
http://www.google.com/linux?num=100&...guardian+ipcop
yields:
"Results 1 - 58 of about 325 English pages for dansguardian ipcop with Safesearch on"
Some things to remember are:
Dan works (worked?) @ SmoothWall.
IPCop is based on SmoothWall.
So, dansguardian should work on IPCop & any dansguardian advice about SmoothWall may be the same for IPCop.