Oh, one other thing:



Based on that description, we can't even be certain that the shutter release device is even a true USB device at all. It might just be something proprietary that *happens* to use the USB jack on the camera.

Yeah, a softer extension cable might be your better bet. Or a longer one, with the extension making a loop on the ground between you and the camera, to remove all vibration transfer.

Finally, you might find that, even after you do all of the above, that your problems aren't due to vibration from the shutter release cable. Maybe it's vibration from somewhere else, maybe even internal to the camera such as the shutter itself.