This is great! Much cheaper than the never-actually-produced Zendock.... Myself + a coworker would both love to purchase this, but we use MBAs and would really like a model with a fourth port hole for a USB cable (as seen in https://www.apple.com/macbook-pro/specs-retina/images/ports_hero.jpg ). We know that USB cables are tricky to design for, as the sizes of the connector block can differ, but we would be happy with the Apple-sized USB ends (e.g. from their keyboards or other peripherals). Please let me know if this is doable, we'd definitely order at least 2!