... it would also remove the need to specify a perl version in order to use non-experimental, permanent features that that particular version brings. For example, need to add use v5.10; to use //= with perl 5.10.
Perhaps I've misunderstood you but I don't think that would be a change. I can quite happily use defined-or-equals without such a declaration in 5.10 (admittedly 5.10.1 which is the nearest version to which I have access - is it different for 5.10.0?).
$ perl -v | head -3
This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi
$ perl -e '$z //= 20; print "$z\n";'
20
$
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