Question: How can I use the USB port on my AirPort Express?
This is in the AirPort Express frequently asked questions (FAQ) with the answer:
Answer: You can connect one printer or a remote control. To learn more, see Uses for the USB port of Time Capsule, AirPort Extreme, AirPort Express.
What does it mean by Remote Control? Apple TV style play and pause from an airport express would be amazing; can you do this??