I guess until HobbyKing make more of these boards this is going to be a lonely place :-)
Yes, I did notice those pins are not connected, I also considered doing what you suggest, soon realized having a voltage reading is almost useless when one Lipo cell can go down while the overall battery pack voltage still appears to be OK.
Instead I am using the HobbyKing "On Board Lipoly Low Voltage Alarm (2s~4s)", it is VERY LOUD and warns about the state of each individual cell, it connects to the balance lead of the battery, which means you have it connected to something instead of just leaving it flapping about.
I have it mounted near the battery using double sided tape, when first connected it beeps LOUDLY a few times, tests all Red LEDs then tests all Green LEDS.
I will bore you with a few pictures :-)