Zero gee
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Again, would unloading the wings save you from uncontrollable roll at lower airspeeds like 190-230 knots?
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Galaxy Flyer
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I would think unloading wouldn't increase control because the problem is the reverse efflux is blanking out the flow over the wing and even zero G won't change that.
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If the efflux over the wing with uncommanded thrust reverse causes massive loss of lift over that wing, then the “normal” amount of lift over the non-effected wing will cause a roll, against which the normal roll controls are not powerful enough.
Unloading to zero g will not magically make the normal roll controls more powerful, but it will reduce the lift on the “normal” wing to zero as well. In that condition, the normal roll controls will be able to supply normal roll control.
Problem with zero g is, (one), passengers and cabin crew will float through cabin, if not strapped in and ,( two), zero g will cause a ballistic path towards the earth, so it cannot be maintained forever. However, a temporary use of zero g may allow roll control during the time that is needed to reduce thrust to idle. Once thrust on the bad engine is at idle (or the bad engine is shut down completely), normal flight with enough normal control effectiveness should be possible again.
For the Lauda accident: the fact that the event happened at night, in cloud, should not have made any difference: the big attitude display of the 767 should have been sufficient for recovery from any unusual attitude. (this remark is in no way meant to detract from the magnificent information given by tdracer, nor meant to criticize the Lauda crew).