[squid-users] Settings per User?

[Joe]

Hi there,

I would like to run squid with the ability to change the settings for 
the user. Is there any way use different settings based e. g. on the 
source ip, that means User with IP 10.6.0.2 uses privoxy to filter ads 
and 10.6.0.6 does not. Is this possible?

I know I can do so with different instances of squid, but I would like 
to run only one instance as it is much easier to maintain. Thanks in 
advance.

regards