External Programs for SquidGuard?

[silverflash]

Hello, 

I've been looking at and working with squidGuard for a few days now.  So far 
I'm quite impressed, but there's one little catch that I haven't quite 
managed to figure out. 

I work for a dial-up ISP and we have a substantial number of users that all 
dial up using the same IP ranges.   Each customer can potentially be either 
a proxy client, or a proxy client that does some rudimentary porn blocking. 

I am able to determine this information from the IP address and have 
considered writing my own squid redirector to do this (and then forward the 
request to squidGuard if necessary), but thought I would ask and see if this 
is possible already before I reinvent the wheel :) 

Thanks!
Mike