For the first part, I'd be inclined to say "it's just syntax." Granted, it's _important_ syntax -- we shouldn't force new syntax on programmers unless absolutely necessary -- but _if_ this is actually something a lot of people want to use, would it be hard to make the syntax perlier? Perl5 may not be the best language to express rules, but I get the feeling that Larry's eminent integration of regex backtracking with the rest of the language may change that somewhat.
For the second -- I personally think top-down is more intuitive, but I don't think the "reconfigure the parser" idea is necessarily tied to "the parser" being top-down. Also, the possibility of doing something like this could factor into your definition of "best".
/s
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