No, it seems to me that what the original did, was allow all methods these object can do, on them all. In fact it sound a lot like tee — which is what I'd base the name of this module on.

Anyway, you original approach looks good to me, except I'd cache the sub, so AUTOLOAD isn't repeatedly called for each method.

sub AUTOLOAD {
    my $self = shift;
    if (my($method) = $AUTOLOAD =~ /::([^:]+)$/ ) {
        no strict 'refs';
        *$AUTOLOAD = sub {
            my $self = shift;
            $_->$method(@_) for @$self;
        };
        $self->$AUTOLOAD(@_);
    }
}
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p.s. Your original calls don't look right, it should be

my $obj_multi = MulitiObject->new( $obj_1, $obj_2 );
$obj_multi->foo($x, $y);          # $obj_1->foo($x, $y);  $obj_2->foo(
+$x, $y);
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sub new {
    my $class = shift;
    return bless [ @_ ], $class;
}
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