re "allows one to use references as hash keys", I didn't realise this was a problem so to be certain I tried this:

#!/usr/bin/perl

use Data::Dumper;

my $var = "VARVALUE";
my @arr = ( 'ARRVAL1', 'ARRVAL2' );
my %hash = ( hashkey1 => hashval1, hashkey2 => hashval2 );
open my $fh, "| more";

my %HOfR = ( \$var => "valForRefOfVar",
             \@arr => "valForRefOfArr",
             \%hash => "valForRefOfHash",
             \&Sub => "valForRefOfSub",
             $fh => "valForRefOfGlob" );

print Dumper( \%HOfR );

sub Sub { };
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...it produced the expected kind of results, i.e.:

$VAR1 = {
          'ARRAY(0x2ddf0)' => 'valForRefOfArr',
          'SCALAR(0x2ddd8)' => 'valForRefOfVar',
          'GLOB(0x228b4)' => 'valForRefOfGlob',
          'HASH(0x2ddcc)' => 'valForRefOfHash',
          'CODE(0x456cc)' => 'valForRefOfSub'
        };
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which makes me wonder what the original problem actually is.