Nope.
In 2007, I asked the Cisco SE and this was the response. I used the Cisco Software Advisor (http://tools.cisco.com/Support/Fusion/FusionHome.do) and checked the IOS feature set (both modular and monolithic) and didn't come up with a hit.
Sorry to disappoint.
If you are interested in using the USB for IOS firmware, I recommend using one of the two Compact Flash (CF) drives. I've used it quiet successfully.
Basically it was built just-in-case the USB function will be incorporated someday.
