First step is to publish the code on somewhere like github, bitbucket, etc. Then post on PrePAN.org. That site is specifically designed for CPAN code reviews. I try to avoid using modules that require 5.10+, because I frequently use different perl versions, from 5.8.9 and up. It only makes sense to restrict the audience if you're relying on a feature of a newer Perl for functionality, not style.