Never flew the A-300 but the diagram appears to show spoilers being used for roll assist, a common feature of most, if not all jet transports. Some also have inboard and outboard ailerons where the outboard ones are locked out at higher speeds.
Lockheed's DLC had little to do with roll but was coupled to pitch control, the spoilers being deflected up to a neutral (ca 8°) position on approach and then they retracted or extended (to a max of ca 16°) as commanded by pitch demands (all-flying tail moved too). This allowed small vertical corrections with no airplane pitch change. Wonderful system. The spoilers were also affected by roll commands in this configuration.
Load alleviation was also brought in by Lockheed on the L-1011-550 series but is a completely different animal, used by most modern designs, especially FBW ones.
Never flew the B-52 either but I believe that it had NO ailerons - roll control was all accomplished by spoilers.