Something to look into here - Nektar's new Footswitch Controller:
http://www.nektartech.com/tablet/pacer-midi-daw-footswitch-controller.html10 (+1) Pedals, each with an LED 'scribble strip', and each pedal can send multiple MIDI messages when pressed, or step through a string of MIDI messages with each subsequent press - lots of uses with Hauptwerk spring to mind.
Sounds very worth looking into, and it sells for less than £200
deW