MW
I did try to place a stop order in the way you describe months ago, and it wouldn't accept it. It didn't occur to me to keep trying.
With regards to the text in brackets - i'll try to explain:
A stop order is a market order once a price has been reached - it does not gaurantee that you will get the price specified, but you will definitely get filled.
If a limit order is dealt it will definitely be dealt at the specified price, but if the market doesn't trade at your price then you won't get filled.
What this order must be is a 'Stop Limit' order:
A 'Stop Limit' order will place a limit order once the stop price has been reached - if the market trades straight through this limit price then you won't get filled.
I know most FX brokers gaurantee that stop orders will get filled with zero slippage (to be honest I can't remember if Oanda is one of them), but this is not a normal stop order.
I really don't know how well this order works, but the fact that Oanda themselves don't think it's a stop order makes me uncomfortable about it.
As i've said Oanda have been fine, but for this one exception, and depending on your trading style many people won't use this type of order. I've still got the account so if GFT don't work out I can always switch back - it's no big deal.
Simon