About time zones, Qt and open source: there is yast Qt TimeZoneSelector, with GPL licensed code. Could it be helpful in creating time zone widget for the replacement clock?
By the way... Since the 'replacement clock' is Qt-based... How difficult would it be to port it to Harmattan-MeeGo-Sailfish?
The main reason for pointing these out is they are "potentially" safe to remove if you have QT worldclock installed. So if it is to become a permanent fixture of Maemo in the future, they could be removed automatically to safe space.
Changes: clock-ui (0.6-2) unstable; urgency=low . * reverted introduced glitch in portrait mode * made timediff format in world clock details equal to default clock
Changes: clock-ui (0.6-3+thumb0) unstable; urgency=low . * prevent opening of multiple worldclock detail windows by multiple fast presses