Using a USB PenDrive for /usr

[Tuc at T-B-O-H]

Hi,

      I've got a Soekris NET4801 running with a SanDisk 2G CF card for
its main driverunning FreeBSD. The system seems to be doing well, but I'm
really hurting on the /usr partition (Its 1.1G) for space. I was 
contemplating adding a 4G USB pen drive (Something like
http://www.memoryx.net/xpe4096.html). Are there any known issues with this? 
I also need to know what the minimum items I need to configure in the kernel
is since I try to run as lean a kernel as possible.

		Thanks, Tuc