Sounds like you're looking for Module::Pluggable. Theres a decent writeup at http://perladvent.org/2004/6th/. If you put all your modules in a MyPlugins directory you can do:

use Module::Pluggable search_path => ['MyPlugins'] require => 1;
## The following is not tested...
BEGIN {
   ## Do the Export and Export_OK into local namespace
   foreach my $plugin (__PACKAGE__->plugins()) {
       $plugin->import();
   }
}
[download]

This might also work but again is untested:

use Module::Pluggable search_path => ['MyPlugins'] instantiate => 'imp
+ort';
[download]

~J