1 middle spoiler is controlled by blue hydraulics, but you can also sideslip the aircraft. I have done few double engine failures in the sim and it did feel exactly like a glider. Also, if the engines are still windmilling, you have all 3 hydraulics, but you will loose them as soon as you slow down to about 230 knots, so they would not have it in this case. I have once in the sim even been able to put the autopilot on during the double engine failure, because of the residual windmilling gave me green and yellow hydraulics. The only bad thin is, that you only have slats and no flaps.
But if the real airplane behaves the same way as the sim, than for an ex glider pilot the airplane feels very predictable.