in reply to Perl hashes: is there some way of adding more data to the value associated with an existing key?

Use hash of arrays, see perldsc. Example:
my %h = (
    1 => ['A', 'B'],
    2 => ['B'],
    4 => ['X'],
    5 => ['V'],
);
print join(' ', @{ $h{1} }),"\n";

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In Section Seekers of Perl Wisdom