Converting passive USB Hub to powered USB Hub, by adding regulated wall-wart as power supply?

The (externally) powered USB hub I have just connects the power supply to the appropriate pins of the USB connectors. Power from the PC is connected trough a diode, so the hub can be powered by the PC or the power supply.

USB specification says that devices should negotiate for the power with the hub or PC, but in practice, just connecting the 5V to the required pins works just as well, especially if the power supply is powerful enough for all devices. Some USB devices (battery chargers, lamps, fans etc) do not negotiate for the power, just connect the power pins to whatever is needed.

I just converted an el-cheapo USB hub to Powered USB Hub, using the Diode method someone posted earlier. I also added a LED so I am sure Hub is working fine. Just tested it using 5v Nokia Charger as power supply, and by connecting USB Mouse+ android + chill pad (thermal master) + a USB Pen Drive, all together never worked earlier on this HUB, they worked like a charm once I connected the tiny nokia charger which gives 5V regulated output.

I might do more experiments later by attaching a LM 7805 based supply to it to see if it can run a laserJet too.

snaps