did a little site search http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=95233&hilit=zipp+rim+heat&start=15
Waldo says it can be done (In Indiana) but he personally doesn't do it nor does he recommend it.
Besides with all the super duper aero benefits of the Zipps what does 20 grams per tube really do for you anyway?
oh yeah this is weight weenies!
i looked at the link you provided. waldo is not recommending against
latex tubes. doesnt recommend for it either. he says the rim strip choice is the issue.
I recommend our rim tape. It's designed to fit our rims well, is reasonably light, holds up well, and is more resistant to braking-induced heat than others I've tested.
Several of our guys are on latex tubes but that's also in Indiana, where even the hilliest stuff to the south is pretty mild relative to many other locales. In the testing we've done so far we've seen that the rim tape is the limiting factor, not the melting point of latex vs. your typical butyl tube. However, this requires further investigation before I could recommend any particular brand for anything approaching severe use in mountainous regions. We've seen quite a bit of variability in other areas of latex tubes so I wouldn't necessarily apply the above statement across-the-board.
as far as tube weight, that's not the reason to go latex, as the lightest butyl are the same weight (or lighter) as latex ones. it's about rolling resistance (but i have a feeling the lightest, thinnest butyl reduce the rolling resistance gap considerably)