Regarding your point 2, could this passage from perlrun be a clue?
PERL5LIB
....
If PERL5LIB is not defined, PERLLIB is used.
....
When running taint checks (either because the program was running setuid or setgid, or the -T switch was used), neither variable is used. The program should instead say:

      use lib "/my/directory";

In reply to Re: Security of Sendmail and -T error by shenme
in thread Security of Sendmail and -T error by bradcathey

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