Sorry to disappoint you, all Nokia branded cables conforms to USB standard, there is _no_ difference between CA-101 vs CA-101D cables, other than that D is much sorter, so you get more mA's through it. So your bug claims are just funny.

What N9 does is the check the datapins, and if pins are not shorted, then it can only charge the battery at max 500mA level, and if d+ and d- is shorted, then it assumes that its connected to external charger and then it can charge power at 1000mA which means that your phone charges faster with d+d- shortened. (and it also goes in charging mode even if your charger only offers 100+mA's)

So basicly if you charge with a long standard usb cable from laptop then N9 can in some cases only see 50mA-200mA and refuse to charge at all. With shorter cable it sees 300-500mA and can trigger charge mode on.

You can compare this to foreample to Apple's non-standard resistor trickery to d+ d- pins in order for external chargers to work like in here http://www.sinfuliphone.com/showthread.php?t=31301
Which just means that if you try to use non-standard iphone chargers to charge N9, it wont work unless you build shorted d- d+ adapter in between.

In summary, all the usb cables are standard, and each manufacturer has its own proprietary trickery to determinate charging mode.

Someone has even made business for it for offering switcher between apple resistor detection vs. d+d- detection: http://elcodis.com/parts/5876568/MAX14550E.html