Thanks Yeez_B!  Yep you're correct, I just tested both pins running them as DigitalInputs, both behaved fine, same other GPIO pins.  Of course driving high signal to IO10 makes the blue LED pulse, but that's a bonus ;-)

No relation between those pins and the Boot and Reset buttons, which is good - now that I take a closer look here at circuit diagram I can see why (just that they line up physically that made me suspicious). 

Soldering to those pads is a bit of pain compared to the ones with holes through, but worth it for the extra two channels.  Thanks Again!!