Apparently I have now made the Brainbench test more valuable. The question about the debugger flag is now alternatively a test of whether you're part of the community and read use.perl. (You may debate the detailed merit of this, but see the next paragraph)
I am coming to the opinion that the test is worthless. All that it gives is a way of automatically determining if someone knows their Perl trivia. It doesn't test actual understanding at all. It doesn't test how someone thinks. And I agree with alternative that the person I was chatting with suggests - a well thought through set of e-mail-able screening questions can elicit answers that you can skim within a minute to decide whether to bin a CV, or procede further with that candidate. Given the volume of CVs that Perl employers get, I don't think that a 1 minute cost per candidate is a problem, particularly if it lets you bin a couple more candidates that Brainbench would show up as "maybes", such that you had to spend the time actually interviewing them.