We recently presented two papers on EMG-based control interface methodologies that tackle the problem of user-specificity. You can find them at:
Mark Ison and Panagiotis Artemiadis, “Beyond user-specificity for EMG decoding using multiresolution muscle synergy analysis,” ASME Dynamic Systems and Control Conference (DSCC), 2013.
Alison Gibson, Mark Ison and Panagiotis Artemiadis, “User-independent hand motion classification with electromyography,” ASME Dynamic Systems and Control Conference (DSCC), 2013.
Panagiotis Artemiadis, ASU