I personally feel certification at some point might be A Good Thing(tm) but what to ask for, who will do it etc.
in reply to Perl Certified!
I personally don't know all THAT much perl developers who know most/all of those topics you mention. I try to learn it all and most I know or briefly touched. IMHO it's like asking people to also learn how to drive a motorcycle, a speedboat, racecar and a truck when they want to learn how to drive a car. Stick to the good interviewing and testing (in person). I took those brainbench exams a few years ago and I passed em every time altho I sucked at perl. There is still a think called logical thinking and you can't uniform that.
... I'm belgian but I don't play one on TV.