Reverse USB Power

Is it possible to provide power from the USB port on the Smoothie? I have a WIFI bridge that I would like to power but the main supply voltage is too high and I don’t really have room to add a step down. Does adding the voltage regulator provide power to the USB port or at least the 5v input pins?

Imported from wikidot

adding the voltage regulator will provide 5V at the endstop inputs or serial port.