hmm..
In perl6 could we have something like this then :)

my %hash = (
 foo => { foo1 => {foo2 => 5 } },
 bar => { baz => [ 1,2,3 ], foo2 => 33 },
 ...
)
[download]

and then access this like :

$hash<*><foo2>
$hash<//><foo2>
[download]

In this case '*' and '//' mean the same thing (just for illustration. regex-like and xpath-like syntax).
This should return all 'foo2' element no matter how deep. Or :

$hash<bar><//><foo2>
[download]

Return only the second 'foo2'..and so on.. you get the idea.
Or this better be done with external module ?
This will make very easy implementing XPath and similar tools.