I think this is an important suggestion. I also wonder if it would make sense to at least enable time zone sends on A/B test emails that are truly split 50/50, without a certain percentage sent to the winner. There’s no test duration to be concerned with in this case. I’m working on implementing A/B tests to my eblasts, which are sent to mailing lists all at once (per time zone), so this would work well enough for my purposes. Ultimately I think more options for A/B testing time zone sends in general should be possible though.