Outbound Message Count Limitations - USAK Diplomacy Judge

I have to send mail through a server that limits my outbound mail to 400
messages per hour. The most recent suggestions on this are from December
2004. In summary:

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Instead of using "sleep" and debugger_command, you can also

1) set the relayhost to a non_responsive IP address,
2) set the process limit in master.cf to 1
3) set the smtp_connect_timeout to 8s.
4) configure fallback_relay = [real-relayhost].

There is at this time no direct mechanism for delayed transmission.
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First, has there been any change since that time? It's not a feature
that I'd expect to be a priority, especially since it's such an annoying
and ineffective way to control traffic, but I have to deal with it for
at least the next 6 months.

Second, if I'm implementing the numbered solution...

1) What do I use for the dummy IP? 10.0.0.0?

2) Can I have a different process limit for the fake relayhost and the
real fallback relay so that one bad destination doesn't choke the whole
thing? Or does it not matter since the fallback relay is basically
caching the traffic?

3) How do I calculate the smtp_connect_timeout for my message count
(400)? Is it as simple as 3600/400 = 9s or can I safely knock off a
second or two for overhead?

4) What's the potential to impact performance? The application
generating these mails only kicks out the limit of 400 messages during
the 11 o'clock hour. The rest of the day, it's ~2000 pieces of mail
total, mostly under 1k. The box is a lightweight AMD 64 with a good
cable connection that's mostly used for an Internet appliance with some
light web development. My main concern is that I don't want to leave my
wife complaining, "Linux is slow," while getting her email on KDE with
Evolution instead of Outlook. No, I can't just tell her to scrap the GUI
and use Pine. The computer is still new enough that I haven't been able
to peel off the "Made for Windows XP" sticker. ;-)

Chris