It would be great to have a couple of additional switch types available out of the box (i.e. without custom skinning), specifically:
* Mini-Moog style toggle switch (2 and 3 way, horizontal and vertical) with ability to select colour;
* Toggle Push-Buttons with built-in LED, like Prophet5 and many other synths;
* Sliders - drawbar style would be a nice addition as would ARP Odyssey style
Alternatively (or maybe as well), like some of my other suggestions, having a library of third-party developed skins for controls and easier import would be a great addition.