It's generally cleaner and more flexible to set up a private perl library and install any modules you need there. That also provides a place to put your own site modules outside the web document tree. I'm assuming that this is a web project on a shared server since you seem to have no cooperation from root.

It's pretty easy to set up CPAN to install to your private perl library. I gave the details in Re: Personal library with CPAN. With that, you can set $PERL5LIB in your crontab and shell rcfile, as httpd environment, or use lib '/my/private/paradise'; to make perl find them.