use Data::Dumper;
    
our @queue = (qw(stuff in queue));
my $server = "name";
$mcvpservers->{$server}->[2] = \@queue;
# ...

my @queue = $mcvpservers->{$server}->[2];
push @queue, "morestuff";

print Dumper \@queue;
__END__
$VAR1 = [
          [
            'stuff',
            'in',
            'queue'
          ],
          'morestuff'
        ];