# home.conf

package MyPackage;

my %config = (
  WIKI_TITLE     => 'MyWiki',
  DEFAULT_TARGET => 'WelcomeToMyWiki',
  DEFAULT_ACTION => 'view',
  # etc.
);

sub get_config {
  return %config;
}

1;

##</code><code>##

require 'home.conf';  # I'm not crazy about this name
# ...
my %config  = MyPackage::get_config();  # copy of original hash
my $frobozz = foobar( $config{ WIKI_TITLE } );

##</code><code>##

package MyPackage;

my %config = (
  # as before
);

sub config {
  my $config_param = shift;
  if ( defined $config{ $config_param } ) {
    return $config{ $config_param };
  }
  else {
    die "Unknown configuration parameter: $config_param";
  }
}

1;

##</code><code>##

require 'home.conf';
# ...
my $frobozz = foobar( MyPackage::config( 'WIKI_TITLE' ) );

##</code><code>##

require 'home.conf';
# ...
*config = \&MyPackage::config;  # make an alias
my $frobozz = foobar( config( 'WIKI_TITLE' ) );