yes, the LAF or MLA (on A340/A330, but more or less a similar system) should reduce the lift of the wings (mainly outer section) to keep the g-loads an the in the design limits and reducing the load at the wing root section.
your absolutely correct, this systems helps to reduce structure weight and increase lifetime.
AFAIK it's installed in all "modern" Airbus and the L1011-500 was/is equipped with a very similar system (not really based on FBW, but both ailerons can deflect upwards). Maybe there some more types i don't know .