Just for the record: Temperature-tolerance (or lack thereof!) traits have been suggested before and I think they’re a great idea. I suspect most all the devs would agree: this is one of those things where if someone codes it, it’ll merge.
Nationality traits are stereotyping at best and will only discourage folks who already get stereotype-flak every day and don’t need it in their Cataclysm. Now that civilization’s ended, we can finally live without getting slur’d at!
(Yeah, we need to clean out some of the existing dialogue, IMO. Existing slurs don’t justify adding more.)