Hi Manfred, sorry for the late reply, I was on duty yesterday flying EDDF-KEWR..
Yes, this would have been my first guess - if the hydraulics are off (or failed) we simulate the so called "manual reversion" - the plane can still be flown with raw muscle power using the cables, but the flightcontrols are not powered, so they are very hard to move, like a car with the servo steering failed. We simulate this by making the controls move SLOW - the real controls are just HARD to move, but we can not simulate that...it may be possible with a force-feedback joystick like you have one, but those are still the exception for simulator users.
I have flown that failure in the simulator a few times, and it is acceptable to have one pilot work the yoke with both hands (and the other one controlling the throttle on his command), because it is pretty much impossible to control the plane that way with only one hand on the yoke.
Glad to hear that you are enjoying the plane, all the best, Jan