You could always just put your key/value pairs into a file like this:

KEY1=VALUE1
KEY2=VALUE2
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then slurp the values in at the beginning of your program:

open(F,"conf.ini");
my %config = {}'
while(<F>) {
  (my $key,$value) = split /=/;
  $config{"$key"} = $value;
}
close(F);
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If you want %config global just declair it as our instead of my, or pass it around with Exporter.