A) Is that the actual code you're using? It doesn't generate any errors for me. And I'm using strict and -w, so that must not be your code. Although I do get an error for your use of the bareword "none"--you should quote that.

B) I usually just do something like this--load the parameters into a hash:

sub do_this_cool_function {
    my %params = @_;
    for my $k (keys %params) {
        print $k, " => ", $params{$k}, "\n";
    }
}
[download]

From glancing at its code, CGI.pm does some really fancy stuff under the hood to rearrange the named parameters. I've never found that necessary for my purposes, but it may be worth checking out if you feel the need to go advanced. :)