I don't think this can be configured — at least not without modifying the source :)

From Carp/Heavy.pm: 

sub ret_backtrace {
  ...

  my %i = caller_info($i);
  $mess = "$err at $i{file} line $i{line}$tid_msg\n";

  while (my %i = caller_info(++$i)) {
      $mess .= "\t$i{sub_name} called at $i{file} line $i{line}$tid_ms
+g\n";
  }
  
  return $mess;
}

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In reply to Re: Shorter Carp stack backtrace by almut
in thread Shorter Carp stack backtrace by Anonymous Monk

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