Just a quick comment (or a shameless plug, depending on how you see it): you might wish to try my Config::FreeForm module, which lets you define arbitrary configuration data structures in memory then write them to disk using Data::Dumper.

You can separate config for different applications etc. into different files, and it manages them for you. You pull in the config sets you want like this:

    use Config::FreeForm sets => [ 'Foo', 'Bar' ];
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It aliases the keys in the config hash into the Config::FreeForm namespace.

Take a look; you might like it.