Took advantage of this benefit.
When I called the PSL, the CSA did not care about for what flight I needed the mileage.
She simply asked how much I wanted, I said a number and she gave it to me right away.
There was nothing about it having to be less than 10% of the flight cost. Did not even book a flight during the call.
I do have upcoming revenue flights that will easily cover the amount I borrowed though.
Now I am wondering if there is payback deadline. The FB site does not mention anything about it.