in reply to
Ensuring cpan modules installed on all computers in a network are consistent
I've never used it before, but the cpan command has an autobundle flag, that will bundle up all the installed modules. Then I think you should be able copy that file for all the users, and then install it. See here:
link and here link
Also, I don't know if you've heard of perlbrew or not, but if your users install perlbrew, they will be able to install any modules they want locally--thwarting your efforts to restrict all users to the modules you've chosen.