One thing that became clear after I recorded and re-watched last nights GadgetBox walkthrough video is that I struggled to explain how the legend worked. I stumbled over how to explain the dual purpose pins and the existing legend required that people decipher and remember that a circle could "be anything" as shown in this screenshot of the legend:

After thinking about it some more I realized we could make things much simpler by updating the silkscreen so there is no deciphering of the legend or remembering that a circle could "be anything":

Hope this makes things a little clearer!

Jack.