Limiting bandwidth for internet sites

Dear Squid staff

I have a site that uses squid at port 80 and works as an http
accelerator (with proxy on) for Apache, that works on port 81

However I want to make Squid limit the ammount of bandwidth that is
being downloaded (only for certain types of files)
For example, I want users browsing my site to have full bandwidth when
browsing, but I want to limit their bandwidth when they download files
from the Download Zone (ej: .zip files)

Therefore, I would like you to include me in any testing this feature.
I've read a lot and emailed the squid users mailing list for over three
weeks and have found no solution to my problem

Regards

Xavier

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S. A. Tech Department