If I'm not mistaken, then Freebitco use 'round half up' and 'round half down' method for the faucet amount calculation. Therefore, we will receive 1 satoshi from the faucet if $0.002 becomes less than 1.5 satoshi for the price surge of Bitcoin. And the faucet will give 2 satoshi as long as $0.002 stays between 1.5 satoshi to 2.5 satoshi.
- I am just familiar with the method used in Dice (Multiply BTC):
1.5 satoshi rounds to 1 (your "round half down") not like Excel's Round which is 2 (your "round half up")
1.51 rounds to 2 (your "round half up").