I think before you start "messing" about with the "Internal package" you need to think how you'll sandbox your changes until they're proven acceptable.

And regardless of whether the dev who changed the DS +r was willfully "breaking the rules" or merely ignorant thereof, you have a discipline problem; not a Perl problem, IMO. That's an opinion furthered by your reference to "finger pointing and hate mongering" -- as that's hardly a sign of community values that will help your organization achieve its goals.

In short, I have to go with BrowserUk's observation, "the threat of the sack...," or, in Americanized form, "Someone with sufficient authority to do so (you?) needs to tell this sucker that you won't need and won't use his/her services if s/he fails to respect the organization's rules and standards."

Life, human and corporate, is too brief to waste time on aggravations like this.