The ability to customize language and region settings would be great. I for one would like to have English (US) language settings and weekday/month names, Swedish date order, while being able to customize decimal separators .
By the way, I'm also hindered by my inability to understand the majority of Americans that just want a sleek and simple / dumb feature-less interface that has oh-so fluid animations; but that's very OT anyway. ... (...i just started to learn LaTeX this week, to avoid the stupidity/control-lessness that are office suite-type word processors. No efforts, no cake)