Modular Synth Panels

A possible option might be to roll your own port-a-pots:

http://moogarchives.com/portapot.htm

Saves eating up panel space. And if you need 10 of them one day, just  
build yourself 10 of them.

Would be nice of some company actually made these for general purpose  
use: injection molded one piece tubular design with a small pot on the  
side, wouldn't need to have a big knob sticking out like the Moog ones.