Write a wrapper in C for your script. Compile that and make it setuid. Something like the following should do...

int main(int argc, char** argv)
{
    execv("/path/to/your/script", argv);
}
[download]

All the usual warnings about security apply twice as much for setuid programs. The webserver runs as nobody for a reason; use extreme caution when subverting it. Of course, you are familiar with the security issues, right? And you've read perlsec? And you have taint checking on? etc. etc. etc.

-sauoq
"My two cents aren't worth a dime.";