Time Zone (actual) Identifiers

As one who routinely (when contract-hunting has been fruitful) jumps across many Time Zones, I really appreciate the “international” time functionality. However, I go to some pretty weird places. Not many of them are included in the calendar Time Zone drop-down list. Hence, I’m often left at a loss as to which city I must select to represent the applicable time zone!
Selecting a Time Zone from a basic map would be the ideal solution to this problem. Penultimately, grouping the cities by Time Zone would be quite helpul.
Could either (preferably the first) be considered for implementation by the Developers, please?

Please open a feature request in the calendar’s bug tracker.