What you're proposing is effectively extending the data manager to support
multiple sort orders. That's not something I've tried, and I doubt it'd be
easy to do. On the other hand, you could always use the existing APIs and
build on top of that. For example, imagine an array or other list structure
that contains the indices of the records in a specific secondary sort order.
You could iterate through the values in this list, and for each one, get to
the corresponding record reasonably quickly. Of course, you'd have to
maintain the index, and that could be quite a challenge. If you stored the
unique IDs of the records instead of the indices, then maintenance would be
simple, but access would probably be prohibitively slow.
-- 
Peter Epstein

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