Recently I've discovered the KMI Softstep: a tiny, but powerful foot controller that works pretty well with the 11R. It is completely programmable, can control up to 6 (!!) parameters per pad (they're not just switches, they can change values in X- or Y-axis, clockwise, counterclockwise, by pressure, you name it...it's incredible. The controller comes with USB port which also powers it, it has a jack for an expression pedal, a 4-digit-display, there is an editor available for Win or Mac, it weighs just 500g,fits in every rack that can hold the 11R, it is pretty durable and even beer-safe! I have bidded on two - and won both, so I can give one away again (see pic). The other one is the only controller I am using right now - and I don't think it'll change ;-)
I sell one for 160 € plus shipping (worldwide). Retail is 210 €. Let me know if you're interested!
See the image of the twins: http://www.frieauff.com/frieauffcloud/IMG_2041.JPG