in reply to Which configuration module?

I use Config::Simple it works very well, except for the tied hash interface where it flattens the sections into a single hash which when dumped looks like:
'newsletter.owner_p1_font' => [], 'newsletter.contact_font' => 'Helvetica', 'newsletter.owner_city' => 'Hamilton', 'system.debug' => '1', 'armtwo.username' => [], 'newsletter.contact_y' => '150',
The tied method of Config::IniFiles is more intuitive.

Config::Simple is pretty widely used and if you have a problem the developer is very responsive.