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The over current problem only typically occurs when third party cables are "charge and sync" which connects the USB 5V .5A power to the DC 5.4V 2A lead instead of the 5V USB line.
Some USB controllers can take the load, others cant.
If you are using a cable, that isn’t "charge and sync" the USB power is drawn on a “USB power” connector, and is only used when the unit is either off (and charging slower then on DC 5.4) or On (but not syncing, or charging). This is how dell designed the x50 to work, knowing that Backlight + CPU + synchronizing would put excessive stress on the USB 5V line.
While experiences have varied, typically is hard to charge the battery without having the full 5.4V 2A when you are under 25% or so charge
If you have a "charge and sync" cable, that hub sounds like the only really "safe" way to go, as blowing the USB on your motherboard could kill the entire thing.
Medevo
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