[squid-users] squid quistions(delay pools)

Hello squid users!
I have some questions regarding squid.
Version of squid i have is 2.5stable3(FreeBSD) - works well. But occasionally some links that should be placed in delay pool do not go there.

Links described as:

    acl slow_links urlpath_regex -i \.mp3$
    acl slow_links urlpath_regex -i \.exe$
    ...

some downloaders put fake parameters on the link to avoid traffic control, i.e.

    http://somehost/someplace/somefile.mp3?param=value

So it forced me to remove $ at the ends of acls and that is a not so good decision. Should the urlpath be only location of information whithout parameters?
And if some link placed in a delay pool - it "displaced" from there after "squid -k reconfigure" command as i saw in real situations. And how can i see what links placed in what pools actualy?

Thanks very much!

-- 
Best regards. Ian.