HID 3 pedal foot switch for 50 USD
throw in a HID-MIDI bridge software and I guess you have a nice foot switch, so that you dont have to keep pressing that shift button on your vci-100. plus maybe one switch for juggle and another one for fader fx mode?
http://www.engadget.com/2010/01/06/brando-offers-usb-triple-foot-switch-on-the-cheap/