I just realized that, so I changed the regex to:

$arr[0..$count] = $url =~ /^http:\/\/.*?\?(?:([\w\d]*=)(?:.*[&]?))*/gi
+;
[download]

(of course still not working properly:))
And to answer your question, I'm fairly firmly fixed just to mechanize module, and that only provides links method, which won't recognize the separate request variables... It is just matter of perfecting the line above:)