sorting threads in digests by number, not date

[Ted Stern <dodecatheon@gmail.com>]

I sort my summary threads as follows:

;; More logical ordering within thread:
(setq gnus-sort-gathered-threads-function 'gnus-thread-sort-by-date)

;;
;; Like Gmail:  bubble most recently active threads to the bottom:
;;
(setq gnus-thread-sort-functions
      '(
        (not gnus-thread-sort-by-most-recent-date)
        ))

This is helpful to me because I get mail forwarded from a variety of
servers, and frequently the dates are out of order.

However, when I use C-d to read a digest, I want to read the
individual messages by number, not date.

Is there a way to modify these sort functions to sort by number when
I'm reading a digest?

Ted
-- 
 Frango ut patefaciam -- I break so that I may reveal