Can squid selectively anonymise?

We have squid 2.2S5 with header anonymization turned on, and provide a
bogus User-Agent string. Some users have had problems with one particular
site that will not allow access unless the browser is a 'supported' type -
determined by a simplistic check of the User-Agent header.

I've complained bitterly to the site maintainers about this, but suspect
nothing will change. I'd prefer to keep anonymization switched on, can I
selectively switch it off for named sites? Are there any other
workarounds?

Thanks,

Simon

-- 
Simon Greaves				voice: (+679) 212114
Computer Centre				fax:   (+679) 304089
The University of the South Pacific	email: Simon.Greaves@usp.ac.fj
Suva, Fiji