"Why would they select only a region and not a location?"
They wouldn't, and the installer will not let them. We chose to split the data into two drop down boxes because there are a large number of time zone cities and users have often complained when these are put in a single drop down box.
The boxes exist as a concession to disabled users (the map does not support accessibility or keyboard control yet, and those who find the map difficult to use, which was a common problem with previous iterations of the map.
"Why would they select only a region and not a location?"
They wouldn't, and the installer will not let them. We chose to split the data into two drop down boxes because there are a large number of time zone cities and users have often complained when these are put in a single drop down box.
The boxes exist as a concession to disabled users (the map does not support accessibility or keyboard control yet, and those who find the map difficult to use, which was a common problem with previous iterations of the map.