And the first attempt at solving the problem is "roll your own!" ... which is usually a bad idea. While your code works, should i really use it? Wouldn't i be better off using an existing Config module instead? I think so.

use Tie::IxHash;
use Config::General;

tie my %conf, 'Tie::IxHash';
%conf = ParseConfig(\*DATA);

for (keys %conf) {
    my $output = eval "$conf{$_}";
    print "$_: ", $@ ? "$conf{$_} - $@\n" : "$output\n";
}
[download]

While it doesn't work completely, this shows that it is very easy to make Config::General do what you want. "Out of the box", it parsed all of your config file.