Are there any GPIO pins that do interesting things while hunting? Something that one could hang some LEDs on?
Nothing exposed unfortunately. If you’re looking for GPIO’s the GPIOs on the Raspberry Pi would be the best ones to use anyway.
Sorry, I meant on the Pi.
I was hoping for some cool blinkenlites that actually meant something. 
I could always fake it.
You could look into this project if you want blinkenlites Fox Hunting with the KrakenSDR