When I need to release a version as a stable one, I need to go through all of the files and change the "use lib" line to point to "/var/www/intranet/stable/lib". (...) Manually go through the files and change the line.

Manually? Are you sure you're a Perl coder? :)

Juerd # { site => 'juerd.nl', plp_site => 'plp.juerd.nl', do_not_use => 'spamtrap' }