Did the "feeler" ailerons of the B-52A-F make air-to-air refueling easier than with the B-52G/H?
The earlier variants were indeed easier to handle. The H-variant featured an independent spoiler panel for finer control to make it easier:

In practice, the short fin combined with spoilers-only lateral control induced a tendency to Dutch-roll and low level handling was more sensitive than on earlier B-52s. Raising the spoilers also caused a slight pitch-up movement which was considered a real problem for inexperienced pilots when flight-refuelling. A later modification (used on the B-52H) the 'Airbrake 1' position gave a 10 degree independent movement on the outer spoiler sections for minor corrections, particularly during flight refuelling. The spoilers were powerful control devices. A B-52G from Robins AFB (28th BS) was landed using only throttles and its spoilers after total failure of the elevator controls. This feat won Crew E-21 the Mackay Trophy for 1982. [emphasis mine]
— Davies, Peter E., Tony Thornborough, and Tony Cassanova. Boeing B-52 Stratofortress. Crowood, 1998.