sort/sort_aux different for sorting threads and sorting within threads

[Charles Killian <ckillian@xxxxxxxxxxx>]

When using "threads" sort, is it possible to use a different sort for
sorting threads and sorting messages within a thread?

In particular, I'd like to sort my threads "reverse-last-date-received",
but the messages within each thread as "last-date-received", so that the
newest "thread" is on top, but the oldest message within that thread is
the first 'N' message in the thread.

I have tried all combinations of (reverse-)threads and
(reverse-)last-date-received without success.

Thanks -
Chip
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Chip Killian
http://chip.kcubes.com