I understand the logic behind the policy change to prevent fake walls coming from small balances, but I think it's a serious problem that traders are now unable to place orders to close out positions if the orders theoretically exceed the balance available.  To clarify, say I'm short 20 btc and my margin balance is low, I can no longer place a 20 btc buy order at a lower price due to the balance requirements; this makes no sense because the entire point of the order is the cover my short and replenish the balance.  It can't be that traders cannot preemptively place orders to close out their existing positions.  Thoughts?