FYI, Data::Dump comes with Data::Dump::Filtered for which you can provide a callback that will be called on each element to be dumped. With the callback you can replace the output string entirely (eg: replace an int value with a constant, or display it in hexadecimal form), add a comment to be printed with the data, ignore some keys from a hash etc...

If it's the formatting you're after maybe perltidy can help you.