Plan C:
Use Yun as virtual mouse cable ( via ethernet or wifi)
Server:Arduino Yun
USB device:Mouse
Client:widescreen laptop
http://forum.arduino.cc/index.php?topic=236947.msg1703011#msg1703011
I am only able make it work at latest kernel, and fail to back port to previous Yun firmware 3.8.3. never try to do on "new" firmware 3.3.8.