That noted, there are well known RFCs published already on the dangers of NATing, so I'm not sure what good it would do to put something in the Node Requirements document.
Finally, I actually don't know what a reasonable requirement would be to add to cover this. If you think you have good text, please send it on the mailing list.
I think you answered the question already. There are enough widely deployed applications (sip for instance) which don't really work over NAT. Given this it would be unfortunate if we didn't take every oportunity to ensure that those applications won't break in ipv6.
Cheers Leif
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