just thinking about that question - I was wondering if you can use the keyboard shortcut (ALT-R) for Cycle Start through a keyboard emulator.
I've seen several pics of proposed pendants and they all show a "Run" or "Cycle Start", as well as a "Pause", or "Stop" and, "Rewind."
I am likewise interested and am organizing the bits and pieces to make a pendant myself.
Long answer, but thats how I came to the same question. Art -- Any insiights?