Hi @walkman
So, the ability to do things on an Apple device comes in two flavors:
Profile and Commands
Now, if you've ever played with Apple configurator, you'd have noticed that you can create a mobile config and add that to a device. You can do the same with SM, just in case there's anything we don't support right now, or you have complexity that the UI just can't handle.
Now, setting the timezone is NOT a profile, but a command. That's handled differently to a profile, which is why you can't upload a mobileconfig to set the time zone
However, all that aside, I made a strong case with product management and explained that, if you don't set the location to "allow" at the time of enrollment, then confusion can occur with regards to where the device thinks it is.
Watch this space.