I think Adon is right, although you can't use it to balance, it's a measurement point which avoids voltage drop on the main leads and is also a common charge connector on low rate chargers.
You can't balance a 1s LiPo, even if it's 2p, there's no way to access the cells individually, by definition they are connected in parallel. You would have to disconnect the cells, but since they are always connected, they will also always be in balance, so there would be no reason to.
I've also found with cells in series they never to drift apart in normal usage. The only time I've had cells go unbalanced is with a fault in the balance lead! I now check the balance with a meter regularly, but never balance charge, because if there's a problem with the lead/charger this could put them out of balance. The balance is just fine when left well alone.
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