Certainly AU setting will get the Auto Zoom enable/disable option [not the Audible Speed Alerts though]. When setting Locale to UK or Luxembourg for example in my 3597 to get Audible Speed Alerts, I will then lose full Voice Command functions in AU without then going to Diagnostics Page [behind Speedo or Master Volume] > Developer Info > Change Locale and selecting Australia there. That restores full Voice Command for AU but still retains the EU Speed Alert feature enabled by the original 'Locale' selection of an EU country. I'm sure it would work that way also for Voice Command and Auto Zoom in Americas locales too provided the secondary Locale choice is available for 2598 in Developer Info as it is for 3597.