Given how easy it is to roll up your own version of perl, I generally behave as if the OS installed version isn't even there & create as many alternate versions as suit us in /usr/local/.
Remember, your OS vendor is only supporting perl to run it's own scripts. If it happens to also work for you, great.
TJD
Comment on Re: How do I keep Red Hat perl RPM updates from damaging our local module upgrades and installations?