I think this is what I might need:

StatINC
default 0, if true, reloads perl libraries that have changed on disk automatically for ASP scripts. If false, the www server must be restarted for library changes to take effect.

A known bug is that any functions that are exported, e.g. confess Carp qw(confess), will not be refreshed by StatINC. To refresh these, you must restart the www server.

This setting should be used in development only because it is so slow. For a production version of StatINC, see StatINCMatch.

   PerlSetVar StatINC 1

I havent had the chance to test yet, apparently I need to install a module first.