Normally I set cgminer to device 0-2 for my 280x's but not sure how I would tell it the device # for the USB stick. Anyone done this? More for fun than anything else.
why not? Simply run two instances of CG miner and set the first instance that runs scrypt to ignore USB:
--usb :0 will disable all USB I/O other than to initialise libusb
Then run the 2nd instance to:
-usb 1:*
I got this info from here:
http://ck.kolivas.org/apps/cgminer/README.
I think I'm planning to do the same thing when I put together my Scrypt rig