If I run the ARDUINO UNO on battery power can I connect it to GND and Vin (as recommend by the arduino website) through your QRSS shield?
All of the standard Arduino pins are fed through the shield in the standard way. So if the website recommends that the Arduino can be powered by Gnd and Vin through a shield, this would apply to the QRSS shield too. But to be sure: can you provide a link to the part of the website that you are referring to?