poopypants compile this one:

https://github.com/gridseed/usb-miner/blob/master/software/cpuminer/

It doesn't send the commands to activate the BTC cores, so you'll be fine with it in LTC only mode.

The miners work pretty interesting however. They used a version of cgminer which already had scrypt support removed. BTC only mode runs with cgminer. LTC only mode with cpuminer. To get dual mode you have to run them side by side - cgminer handles BTC like normal, cpuminer only polls work to do from the pools then sends it in upd packets to cgminer which gives it to the LTC cores. cgminer then sends the results back in upd packets to cpuminer...