in reply to Is there any way to shut off deprecated, dangerous, dilapidated, or otherwise undesirable language features?

No, not with feature, but CPAN pragma modules, see 984059. For some of the stuff you mention, you can also employ the criticism pragma.

If you're looking for an improved Perl for new projects, use perl5i. It contained many fixes that do not go into mainline Perl for backwards compat reasons.

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