It is ok, in this case , please contact our email [email protected]
We will give you an unique,permanant address where you can keep your btc, and when ever you want to send to the real bet address. we will send the amount from that permanant address as your order( but we may have min requirement , like at least 0.01btc, and we will cover the trans fee, with our hot wallet), and also you can email us to withdraw from the special address.
In other word, it works like a login system.
IMO, do not use the login system, if you are really betting. The fee you save is just a little. but the risk is great big ,especially , the platform( exchange) will become risky when keeping great money ( think about the MTGOX). The best way is get your money after every round.