I'm afriad I don't agree with you. Per the IO::Handle manpage:

 The following methods are not supported on a per-filehandle
     basis.

         IO::Handle->format_line_break_characters( [STR] ) $:
         IO::Handle->format_formfeed( [STR])               $^L
         IO::Handle->output_field_separator( [STR] )       $,
         IO::Handle->output_record_separator( [STR] )      $\

         IO::Handle->input_record_separator( [STR] )       $/
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