Sorting selections in MCEDIT

I've searched all over the net, read the MCEDIT and MC man pages, pressed
F1 in the proper context, and I can't find any reference to the sorting
parameters for the OPTIONS/SORT command in MCEDIT.

I tried a bunch of things to get it to reverse the default sort order, and
finally found that "-r" would do it.

Is there a reference anywhere, or could someone who is familiar with
MCEDIT's internals, post what the options actually are? I'd love to be able
to do more complex/specific sorts, particularly using specified parts of
lines as the key rather than just from the first characters.

TIA.

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