WetFeet
You might have to rest worried then... Too many special requirements... If you give me 2, 3 days to prepare every city pair, maybe. Different noise abatement, do I have to say squawk on first contact or not, if cleared direct on a STAR you still have to comply with ALT restrictions abeam a no-more valid waypoint (in OZ you do!), almost every AP has got different Radio fail proc, do I call 10 before ready for push, or when ready, what do I have to tell them.... And that is not even taken into account every operational special ops, like fueling with pax on board, de-icing, you name it.
It's not unsafe, but impossible to cope with every local specialty...
But the topic is a different one. What is the ICAO standard with regards to speed assignment after approach clearance received.