Are there other (better?) ways to achieve this, any problems with using "our" in this way?

No, that seems a pretty standard way to do it.

A couple of small points with your code tho':

• Names in all lower case are usually saved for "pragmatic" modules - i.e. those that change the way the program executes (like strict and warnings). You'd probably be better advised to call it YourAppName::Config.
• Your shebang line looks broken. Shouldn't it be /usr/bin/perl (with a leading '/')?
• If you have "use warnings" then you no longer need '-w'.

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