Max RCPT TO: - option to negotiate?

Sendmail 8.9.0 (currently in beta test) supports a local configuration option
to limit the maximum number of RCPT TOs as documented thusly:

confMAX_RCPTS_PER_MESSAGE  MaxRecipientsPerMessage
                    [infinite] If set, allow no more than
                    the specified number of recipients in
                    an SMTP envelope.  Further recipients
                    receive a 452 error code (i.e., they
                    are deferred for the next delivery
                    attempt).

Does anybody see a need/desire/etc for an ESMTP option to advertise
this limit, so the upstream end can avoid sending a RCPT TO: that
will just get 452'd anyhow?

Straw man proposal:

250-MAXRECIP nnn    to state that more than nnn receipts will not be accepted.

Comments? 

                                Valdis Kletnieks
                                Computer Systems Senior Engineer
                                Virginia Tech