The Nook HD+ needs a specific voltage (or range of voltages) on the two USB data pins. These are different voltages than the standard 500ma, 1000ma, or Apple settings. .
Once you described "500ma, 1000ma, or Apple settings" as voltages, I stopped reading for serious content.
Students of advanced physics will be interested in the last item as a new unit of voltage (or was it current?)
To everyone else: All USB devices take the same voltage (5 vDC), with some amount of variation allowed. This has nothing to do with the current required by the device, which can vary greatly.
As someone who spends a significant amount of time designing consumer power distribution circuits, I can say that using a resistor network to control voltage is, in most cases, a fool's errand. Devices may work temporarily in such situations, and then fail in other situations.
And for what? There is absolutely no need for the "modification" in the original message.
There are several posts around the web reagarding the voltages to put on the data pins to support charging Apple devices. This is typical:
"Nowadays the iPhone expects a certain voltage on those two pins to decide how much current to absorb from the charger. Putting a 2.0 V voltage on both the pins the iPhone will absorb about 500 mA, while with 2.8 V on D- and 2.0 V on D+ it will absorb about 1000 mA" There are also schematics for the resistor dividers used. http://www.instructables.com/id/Modify-a-cheap-USB-charger-to-feed-an-iPod-iPhone/
I don't appreciate the obtuse analysis that somehow implies the voltages on the data pins needed to support certain current supplies on the power pins is somehow mixing the units of current and voltage. This is not helpful and seems intended to discredit a technically detailed, complete, and working solution.
I did for the Nook HD+ what many before me have done for the Apple devices by providing a soluton customized for the Nook HD / HD+.