"In the Citation you will loose control if you don't get it stowed."
The Il-62 not a Citation! Length, weight and center of gravity are huge factors when yaw and controllability are involved. The Citation is very light and very short with the center of gravity close to the center of thrust.
The ratio between the length from fuselage center line to engine centerline by the length from the center of gravity to the center of thrust is so small on the Citation there would be a great amount of yaw. So, yaw would be a much greater problem.
On the Il-62, it is heavy and long with the engines close to the centerline and center of gravity far from the center of thrust. The ratio is large enough that it would not be a problem. Also Remember this is never done with thrust being applied, only idle speeds. Which equates to very little thrust on this aircraft. So, it's more like throwing out a small drag cute as opposed to full reverse thrust.