Its possible, just not necessarily easy. You would need to make a custom part for the switch by editing the svg files for the 12 position switch and make it smaller (at least in pcb). Pointers to a couple of tutorials on parts making:
(Edit: November 2016: This is an updated (and corrected) version of the original parts creation howto. This version corrects some suggestions (mostly saving Inkscape files as optimized svg which turns out to cause other problems) with the first version and expands the section on parts testing. While there doesn’t appear to be a lot of interest in this subject I’ll make at least this update so the information is as correct as I can get it.)
This is a description of how I made the Valor PM6078-00…
Fritzing Part Creation - Chapter3 - Inkscape Advanced Essentials
Learning how to draw in Inkscape - more features.
0:00 Overview
0:16 Select object with cursor and XML Editor
3:34 Manipulate special PDF’s in Inkscape
4:33 XML Editor - Direct drawing manipulation
6:05 XML Editor - Making group, moving object, changing layer height
7:27 Cursor - Changing layer height
8:21 Ruler
9:07 Grids
9:28 Snap selection
10:16 Drawing origin
Peter